Field reference for fuel system and underground storage tank technicians. 151 entries, taken from the DropTubeBuilder app.
These notes are the web copy of the DropTubeBuilder reference, built for fuel system and underground storage tank technicians. The same library is free inside the app, with no time limit and no account, and it works with no signal.
Reference notes from DropTubeBuilder, the offline field tool for fuel system technicians who cut overfill drop tubes, build tank charts and chase dispenser faults. It works with no cell signal, because the sites do not have any.
Get DropTubeBuilder on the App StoreThe dispenser database failed its integrity check. Data the dispenser relies on cannot be trusted. Action: record the current totals and configuration before doing anything, because recovery may clear them; power cycle and see whether the fault clears on a clean start; check for an unstable supply or repeated power interruptions, which is the usual root cause of corruption; check for a recent interrupted software download; reload the database from the site controller if the dispenser supports it; verify every price, grade and configuration value afterwards rather than assuming the reload was complete; if it recurs the board is suspect, so escalate rather than repeatedly reloading; check calibration and metrological settings survived, since a database rebuild can restore defaults
Flash memory has failed its integrity check. The dispenser's stored program or data is not reliable. Action: record configuration and totals before attempting recovery; power cycle and see whether the fault repeats on a clean start; check the supply for instability or repeated interruptions, which corrupts flash during writes; check whether a software download was interrupted, since that is the most common single cause; reload the software using the correct version for this dispenser and let it finish without interruption; if flash fails again after a clean reload, the board is failing and needs replacing; verify calibration and configuration after any recovery
The internal LON network configuration does not match what the dispenser expects. Nodes are either missing, duplicated or addressed wrongly. Action: check which nodes are expected for this dispenser build and which are actually reporting; check node addressing for duplicates, which is common after a board swap; check the LON wiring and terminations between nodes, including anything disturbed by recent work; check node software versions are compatible with the main board; reseat each node and its connectors; power cycle and let the network re enumerate; if a node was deliberately removed, correct the configuration to match
One or more internal software tasks did not start. The dispenser has come up incomplete rather than failed outright, which is why some functions may appear to work. Action: power cycle and see whether it comes up clean; check for an interrupted or partial software download; check the supply is stable and adequate, since a brownout during boot causes this; check for a hardware fault preventing a subsystem initialising, particularly a node that is not responding; reload the software if it repeats; escalate if it persists after a clean reload, since this points at the board
A cold start was forced, so the dispenser restarted and cleared its working state. Action: establish whether the cold start was deliberate, since a technician performing one is normal and needs no action; if nobody forced it, check the supply for interruptions, brownouts or a failing power supply; check the incoming voltage under load rather than at rest; check for loose or corroded supply terminations in the dispenser; verify configuration, prices and calibration survived, and re enter anything lost; if cold starts repeat without cause, treat the power supply as suspect
The redundant copies of stored data do not agree. The dispenser keeps a second copy specifically so it can detect this. Action: record the current configuration and totals; power cycle and see whether it resolves to a consistent copy; check the supply for instability, which is the usual cause of a write completing to one copy and not the other; check for an interrupted software download or a cold start during a write; verify all values against your records afterwards rather than trusting whichever copy won; if it recurs, the memory or the board is failing
A firmware upgrade was attempted with the calibration switch not engaged. The dispenser blocks this deliberately, because firmware affects metrology and the switch is what proves a sealed setting was opened knowingly. Action: this is a procedural block rather than a fault, so nothing is broken; confirm you are authorised to break the Weights and Measures seal before proceeding; engage the calibration switch, repeat the upgrade, and let it complete without interruption; verify calibration and configuration after the upgrade; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
The database changed and the dispenser has applied default values in place of what was there. Anything not explicitly reconfigured is now at default, including values that matter for billing. Action: treat every configurable value as suspect and check it, do not spot check; verify unit prices, grade mapping, volume units and flow settings before allowing sales; verify calibration and ATC settings, since defaults here have metrological consequences; establish what caused the change, commonly a software update, a cold start or a corrupted database; check the supply if this followed a power event; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
RAM has failed its integrity check. Nothing the dispenser reports can be relied on while this is present. Action: power cycle and see whether it comes up clean; record what configuration can still be read; check the supply for instability and check for overheating in the electronics enclosure; check the board for physical damage, corrosion or water ingress, which is common in coastal and high wash sites; if RAM fails again after a clean restart the board needs replacing, so do not keep clearing it; verify configuration and calibration fully after any recovery
The hardware present does not match the hardware the configuration describes. Action: list what the configuration expects and compare it against what is physically fitted; check whether a board, node or module was recently swapped for a different variant; check part numbers and software versions of any replaced component, since a superficially identical board can be a different variant; correct either the configuration or the hardware so they agree; power cycle and confirm the dispenser enumerates everything it expects
Calibration factors were restored from door node storage. The dispenser has recovered metrological data from its backup copy rather than from its own memory. Action: verify the restored calibration is actually correct rather than assuming the backup was current; check the restored values against your records and the last calibration certificate; run a meter proving test before returning the dispenser to sale, since restored calibration has not been proven on this hardware; establish why the primary copy was lost, usually a board swap, a corrupted database or a power event; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Two wire communication between the dispenser and the site controller has failed. Corroded or damaged two wire cabling causes most of these, not the boards at either end. Action: check the two wire cable and its terminations at both ends for corrosion, water and loose screws, starting at the dispenser junction box; check for water in the junction box, which is the single most common cause; check polarity, since a reversed pair after recent work will not communicate; check the cable for damage where it passes through the island and conduit, including anything crushed during construction; check the site controller is powered and that other dispensers on the same loop are working, which tells you whether the fault is site wide or local; check for a shorted or grounded conductor, and megger the pair if the fault is intermittent; only suspect the interface board once the cable is proven
The pulser and product mapping disagree, so either a pulser is connected and its product is not mapped, or a product is mapped and its pulser is not connected. Action: check the pulser is connected and its harness is seated at both ends; check the product mapping in programming against what is physically plumbed to that meter; check the pulser harness for damage, chafing or a pinched conductor; check whether a recent meter or pulser replacement was left unmapped; confirm the pulser type matches what the configuration expects; correct whichever side is wrong and power cycle to confirm
The volume unit type has not been set. The dispenser does not know what unit it is measuring in, which makes everything it reports meaningless. Action: set the volume unit correctly for the jurisdiction before allowing any sale; verify the setting against what the site is required to sell in; check whether the value was lost rather than never set, which points at a database or power problem; verify calibration and totals after setting it; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
The pump is not calibrated. It cannot legally be used for sale in this state. Action: do not return the dispenser to sale until it is calibrated and proven; establish whether calibration was lost or never performed, since lost calibration points at a database, board or power problem that will recur; check whether a recent board swap or software update cleared it; calibrate and prove the meter using the correct test measure procedure; record the calibration and arrange resealing; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
The two wire ID for side A has changed. The dispenser is presenting a different address than it was. Action: establish whether the change was deliberate, since an ID is normally set by a technician; check for a duplicate ID on the loop, which makes two dispensers fight and produces intermittent faults at both; check the ID matches what the site controller expects for this fuelling position; check whether a board swap brought a different stored ID with it; correct the ID and confirm the controller sees the correct position; verify pricing and grade mapping afterwards, because an ID change can attach the wrong prices to the wrong position
The two wire ID for side B has changed. The dispenser is presenting a different address than it was. Action: establish whether the change was deliberate, since an ID is normally set by a technician; check for a duplicate ID on the loop, which makes two dispensers fight and produces intermittent faults at both; check the ID matches what the site controller expects for this fuelling position; check whether a board swap brought a different stored ID with it; correct the ID and confirm the controller sees the correct position; verify pricing and grade mapping afterwards, because an ID change can attach the wrong prices to the wrong position
The valve did not open when commanded. Action: check the valve is receiving its drive signal, which separates an electrical fault from a mechanical one; check the valve coil for an open or shorted winding; check the harness and connector at the valve, including water in the connector; check the valve mechanically for debris, seizure or a failed return spring; check the shear valve below is open, since a closed shear valve gives no flow and can be mistaken for a valve fault; check the dispenser filter, since a blocked filter starves the valve and looks similar; replace the valve only once the drive signal is proven present
A catastrophic error has occurred on the VaporVac system. Vapour recovery is not functioning. Action: check the vapour hose and connections first, including for kinks, blockage and damage; check the VaporVac motor for power and for mechanical seizure; check the motor harness and connector; check the VaporVac board for power, communication and water ingress; check for liquid in the vapour path, which is a common cause of repeated failures; vapour recovery is enforced by your local air district rather than federally, so check what downtime and reporting your jurisdiction requires; record the outage, because vapour recovery has its own compliance record separate from the tank
Either the emergency stop was activated, or the VaporVac failed on one side. These are very different situations, so establish which before doing anything. Action: check whether the emergency stop is actually latched in, and if so find out why it was pressed before resetting it; do not reset an E stop without establishing the reason, since it may have been pressed for a real emergency; if the E stop is clear, work it as a single side VaporVac failure; check the vapour hose, motor and harness on the affected side; compare the failed side against the working side, which is the fastest diagnostic available on a two sided unit; check the E stop switch and wiring if it reports pressed when it is not
A configuration data error. The stored configuration is not valid. Action: print or record what configuration can still be read; check every value rather than spot checking, since a partly valid configuration will run and give wrong results; verify prices, grade mapping, volume units and calibration; establish the cause, commonly a power event, an interrupted software download or a failing board; reload configuration if the dispenser supports it, then verify it completely; if it recurs, treat the board or the supply as the underlying fault
Event log entry recording that PIN code one was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that PIN code two was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the cash and credit option was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify the cash and credit prices now shown are correct, since this directly affects what customers pay; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the side exist option was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; confirm the dispenser is configured for the number of sides actually fitted; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Either the price per unit option changed, or a valve is stuck or has timed out. Treat the valve possibility first, because it has consequences and the option change does not. Action: check whether a valve is stuck or failed to operate within its expected time, and if so work it as a valve fault; check the valve drive signal and the coil; check the valve mechanically for debris and seizure; if no valve fault exists, check whether the PPU option was changed and by whom; verify current pricing is correct before allowing sales; check the event log timestamps to separate the two causes
The PPU board saw the pump handle on at power up. The dispenser will not authorise with a handle already lifted, which is a safety behaviour rather than a fault. Action: check whether a nozzle is genuinely left up, which is the usual explanation; return the handle to the hung position and power cycle; if no handle is up, check the hang up switch for sticking, damage or water; check the switch harness for a short to ground; check the switch adjustment, since a maladjusted switch reads as lifted; test the switch directly before replacing anything
Communication with the point of sale has been lost, so the dispenser is disconnected from the site system. Action: check whether other dispensers are also disconnected, which separates a site fault from a dispenser fault immediately; check the two wire or network cable and terminations at the dispenser junction box, looking for water and corrosion; check the site controller and its interface board are powered and running; check whether the POS system was restarted or updated, which is a common cause; check the dispenser's address matches what the POS expects; check for a duplicate address on the loop causing intermittent dropouts
Blend ratios have not been programmed. The dispenser cannot deliver a blended grade without them. Action: programme the blend ratios for each blended grade against the site's product specification; confirm the low and high octane feeds are mapped to the correct meters before setting ratios; verify the resulting blend by proving each blended grade, not just the straight grades; check whether the ratios were lost rather than never entered, which points at a database or power problem; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
The low octane product is flowing but below the rate the blend needs. A blend cannot be held accurately when one leg is starved, so the delivered grade may be off specification. Action: check the dispenser filter on that leg first, since a partially blocked filter is the most common cause; check the shear valve on that leg is fully open, not partly closed; check the STP for that product is running and making normal pressure; check the meter and the blend valve on that leg for debris or partial seizure; check the tank has adequate product and no water at the intake; prove the blend after correcting, because the grade delivered while this was active may not have met specification
The high octane product is flowing but below the rate the blend needs. A blend cannot be held accurately when one leg is starved, so the delivered grade may be off specification. Action: check the dispenser filter on that leg first, since a partially blocked filter is the most common cause; check the shear valve on that leg is fully open, not partly closed; check the STP for that product is running and making normal pressure; check the meter and the blend valve on that leg for debris or partial seizure; check the tank has adequate product and no water at the intake; prove the blend after correcting, because the grade delivered while this was active may not have met specification
No flow at all on the low octane leg. The dispenser cannot blend. Action: check the shear valve on that leg, which is very commonly left closed after service; check the STP for that product is running and the tank has product; check the dispenser filter for complete blockage; check the blend valve is opening, electrically and mechanically; check the meter is not seized; check the pulser on that leg is reporting, since a dead pulser reads as no flow; work from the tank forward rather than starting at the blend valve
No flow at all on the high octane leg. The dispenser cannot blend. Action: check the shear valve on that leg, which is very commonly left closed after service; check the STP for that product is running and the tank has product; check the dispenser filter for complete blockage; check the blend valve is opening, electrically and mechanically; check the meter is not seized; check the pulser on that leg is reporting, since a dead pulser reads as no flow; work from the tank forward rather than starting at the blend valve
The high octane product has been contaminated by low octane product. Product is crossing between grades inside the dispenser, which means customers may have received off specification fuel. Action: take the dispenser out of service, since this affects product quality and not just the equipment; check the blend valves for leakage past the seat, which is the usual path for cross contamination; check the check valves on each leg; check for a stuck valve holding a path open; check the tank inventories and grades to establish how far the contamination reached; sample and test the affected product before returning the dispenser to sale; consider whether the affected tank needs attention, not just the dispenser
The low octane product has been contaminated by high octane product. Product is crossing between grades inside the dispenser, which means customers may have received off specification fuel. Action: take the dispenser out of service, since this affects product quality and not just the equipment; check the blend valves for leakage past the seat, which is the usual path for cross contamination; check the check valves on each leg; check for a stuck valve holding a path open; check the tank inventories and grades to establish how far the contamination reached; sample and test the affected product before returning the dispenser to sale; consider whether the affected tank needs attention, not just the dispenser
A valve the configuration expects is not responding. Action: check the valve is physically fitted at that position; check the harness and connector at the valve and at the valve board; check the coil for an open circuit; check the valve board is powered and communicating; if that valve does not exist on this dispenser, correct the configuration; swap the harness with a working position to separate the valve from the drive
A valve is stuck. Depending on which way it is stuck this means no flow, or flow that should not be happening. Action: determine which way it is stuck before anything else, since stuck open is a safety and loss issue and stuck closed is only an outage; if it is stuck open, take the position out of service immediately; check the valve mechanically for debris, scoring or a failed spring; check for contamination in the product, which is the usual cause of repeat sticking; check the dispenser filter condition, since a collapsing filter sheds material into the valve; check the drive is not holding the valve energised through a shorted driver; clean or replace the valve, and address the contamination or the filter will do it again
The valve board is not responding. Every valve it drives is unavailable. Action: check the board has power and its indicators behave normally; check the board's network connection and connectors; check its addressing and software version; reseat the board and its harnesses; power cycle and see whether it enumerates; check for water ingress or corrosion on the board, which is common in the hydraulic area; swap with a known good board to confirm before ordering
Event log entry recording that the calibration for meter 0 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the meter against a certified test measure before returning it to sale, since this entry means billed volume may have changed; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the calibration for meter 1 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the meter against a certified test measure before returning it to sale, since this entry means billed volume may have changed; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the calibration for meter 2 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the meter against a certified test measure before returning it to sale, since this entry means billed volume may have changed; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the calibration for meter 3 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the meter against a certified test measure before returning it to sale, since this entry means billed volume may have changed; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the calibration for meter 4 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the meter against a certified test measure before returning it to sale, since this entry means billed volume may have changed; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the calibration for meter 5 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the meter against a certified test measure before returning it to sale, since this entry means billed volume may have changed; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the calibration for meter 6 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the meter against a certified test measure before returning it to sale, since this entry means billed volume may have changed; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the calibration for meter 7 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the meter against a certified test measure before returning it to sale, since this entry means billed volume may have changed; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
A display button was pressed during power up. This usually means someone was entering a diagnostic or programming mode, deliberately or otherwise. Action: establish whether a technician was entering a service mode, which makes this expected; if nobody was, check the button for sticking or water holding it in; check the button harness for a short; power cycle without touching the panel and confirm it comes up normally; verify no configuration was changed while in that mode
The power circuit registered a power loss. Action: check whether this coincides with a known site power event, which makes it informational; check the incoming supply and breaker; check terminations for looseness and corrosion under load; check the power supply board; verify configuration and calibration survived; if these repeat without an external cause, the supply or the power board is failing
Reverse flow has been detected. Product moved backwards through the meter. Action: stop using the position until this is understood, since reverse flow can mean product is moving between grades; check the check valve in the meter or the dispenser inlet, which is the usual mechanical cause; check for a leaking or stuck valve allowing back feed from another line; on blenders check the blend valves for leakage between products; check the pulser wiring and direction sensing, since a miswired quadrature pulser reports reverse flow that is not happening; check for a siphon condition pulling product back toward the tank; confirm with an actual dispense once the mechanical cause is cleared
No flow was detected when flow was expected. Action: check the obvious first, whether the tank has product and the STP is running; check the shear valve is open, which is very commonly left closed after service; check the dispenser filter for blockage; check the solenoid or flow control valve is opening, both electrically and mechanically; check the pulser is reporting, since a dead pulser reads as no flow even when product is moving; check the meter for seizure or debris; work from the tank forward rather than starting at the dispenser
Flow was detected when the dispenser had not authorised it. Product moved without a sale. Action: treat this as both a loss and a safety issue, and take the position out of service until it is understood; check the solenoid or flow control valve for leakage past the seat, which is the usual cause; check the valve is not stuck open mechanically or held open electrically by a shorted driver; check the nozzle and hose for leakage; check the pulser for false pulses from electrical noise, which reports flow that never happened; check the hang up switch is reporting correctly, since a stuck switch can leave the position live; reconcile against tank inventory to find out whether product actually left
The pulse pattern coming from the pulser does not match the profile the configuration expects for that meter. Either the wrong pulser is fitted, or the pulser is failing, or the meter profile is wrong. Action: confirm the fitted pulser is the correct type and part for this meter, which is the most common cause after a replacement; check the meter profile programmed for this position; check the pulser harness and connector for damage, water and loose pins; check the pulser is correctly mounted and driven, since a slipping or misaligned coupling produces a corrupt pattern; check for electrical noise on the pulser wiring, particularly where it runs alongside power conductors; swap in a known good pulser to separate the pulser from the wiring
STP 1 is configured but is not connected. Action: check the STP control wiring and its terminations at the dispenser and at the controller; check the STP relay is present and operating; check the STP itself has power and is not locked out by a leak detector or a tank alarm; check whether a tank alarm or a line leak alarm has disabled the pump, which is a common cause that looks like a wiring fault; check the configuration expects this STP at all, and correct it if the position was decommissioned; confirm the pump runs and makes pressure once the fault clears
STP 2 is configured but is not connected. Action: check the STP control wiring and its terminations at the dispenser and at the controller; check the STP relay is present and operating; check the STP itself has power and is not locked out by a leak detector or a tank alarm; check whether a tank alarm or a line leak alarm has disabled the pump, which is a common cause that looks like a wiring fault; check the configuration expects this STP at all, and correct it if the position was decommissioned; confirm the pump runs and makes pressure once the fault clears
Communication with the main board has been lost. Action: check the main board has power and its indicators behave normally; check the internal network wiring and connectors, including anything disturbed by recent work; check for water ingress and corrosion in the electronics enclosure; reseat the board and its harnesses; power cycle and see whether it comes back; check whether other nodes are also down, which points at wiring or power rather than the board; swap with a known good board to confirm before ordering
The main board has recorded a power failure. Action: check the incoming supply and the breaker feeding the dispenser; check terminations in the dispenser for looseness and corrosion, measuring under load rather than at rest; check the power supply board output; check whether the event was site wide, which points at the supply rather than the dispenser; verify configuration, prices and calibration survived the event; if power failures repeat without an external cause, treat the power supply as suspect
The button configuration is in error. Action: check the button configuration against what is physically fitted on this dispenser; check for a duplicated or conflicting assignment; check whether recent work changed the panel or the button set; correct the configuration and power cycle; test each button afterwards rather than assuming the fault cleared
The price per unit displays are not addressed correctly. Action: check each PPU display's address against the position it occupies; check for duplicate addresses, which is common after a display swap; check the harness and connectors to each display; correct the addressing and power cycle; confirm each display shows the correct grade and price afterwards, since wrong addressing shows the wrong price to customers
The PPU is not communicating with the main board over the internal network. Anything that node controls is unavailable until the link is restored. Action: check the node has power and that its indicator behaves normally; check the network wiring and connectors to that node, including anything disturbed by recent work; check the node is correctly addressed and has not been duplicated with another node; check the node's software version matches what the main board expects; reseat the node and its connectors; power cycle the dispenser and see whether it enumerates; swap the node with a known good one of the same type to separate a node fault from a wiring fault
The PPU configuration does not match. The programming and the fitted displays disagree. Action: check how many PPU displays are fitted against how many are configured; check the display types match what the configuration expects; check addressing for duplicates or gaps; check whether a display was replaced with a different variant; correct whichever side is wrong and confirm every price displays correctly
A PPU reset failed. Action: power cycle the dispenser and retry; check the PPU board has power and is communicating; check the display harnesses and connectors; check addressing and software versions; reseat the board and its connections; verify displayed prices are correct afterwards before allowing sales
A display failed to initialise. Action: check the display harness and connector at both ends, since a loose connector is reported as a failed display far more often than the display has actually failed; check the display has power; check for water ingress behind the display, which is common on outdoor units; reseat the connector and power cycle; check the display type matches the configuration; swap with a known good display only after the connector and harness are proven
Display data corruption has been detected. What the customer sees may not match what the dispenser is doing, which matters when it is showing price or volume. Action: take the position out of sale if price or volume is displaying wrongly; power cycle and see whether the display comes up clean; check the display harness and connector for damage and water; check for electrical noise on the display wiring; check the display and controller software versions are compatible; verify the displayed price and volume against an actual dispense before returning to sale
The density measurement is out of range. Action: check the sensor and its wiring before assuming a product problem; check the sensor is clean and correctly positioned; check the configured density limits are correct for the product actually in the tank; check the product itself if the sensor proves sound, including for contamination or the wrong grade delivered; check tank records for a recent delivery that could have changed the product
The temperature measurement is out of range. Action: check the probe and its wiring, which is more often the cause than a genuine temperature excursion; check the probe connector for water and corrosion; compare the reading against another position on the same site; check the configured limits are sensible for the climate; note that a wrong temperature reading affects ATC and therefore billed volume, so verify ATC operation after any repair
A security switch tamper has been detected. Someone opened something that is monitored. Action: treat this as a security event and document it with its timestamp before clearing; establish whether authorised service work explains it, which is the common benign cause; if nobody can account for it, inspect for interference with the pulser, the meter, the wiring and any added device; check the sealed settings and calibration for changes; escalate to the site owner rather than quietly resetting if tampering is suspected; prove the meter before returning to sale; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
The CNG pressure sensor has failed. On compressed natural gas this is a safety relevant sensor, not just a measurement one. Action: take the position out of service until the sensor is proven, since pressure monitoring is a safety function on CNG; follow the site's CNG specific safety procedures, which differ from liquid fuel work; check the sensor wiring and connector; check the sensor itself against a known reference; verify the pressure relief and shutdown functions still operate; do not return to service on an unproven pressure sensor
The CNG temperature sensor has failed. Temperature is used in the fill calculation on CNG, so this affects both safety and measurement. Action: take the position out of service until the sensor is proven; follow the site's CNG specific safety procedures; check the sensor wiring and connector; check the sensor against a known reference; verify fill behaviour and temperature compensation after repair; prove the fill before returning to sale
The vapour recovery system has failed. Action: identify which part of the system is reporting, since vapour recovery covers the hoses, the nozzles, the vacuum source and the monitoring; check the vapour hoses and boots for damage, kinks and blockage; check the nozzles for damaged bellows and blocked vapour paths; check the vacuum source is running and making its expected flow; check for liquid in the vapour return path; check the monitoring sensors and their wiring; your local air district sets the requirements here, so check what testing and reporting is required after a failure
A grade selection error has occurred. Action: check the grade select buttons and their harnesses; check the grade mapping in the configuration against what is plumbed; check for a stuck grade button holding a selection; check the blend configuration if this is a blending dispenser; test each grade selection after correcting, because the risk here is delivering the wrong grade
The encrypted pulser has reported a tamper condition. This is a security feature, not a measurement fault, and it exists because pulser tampering is a known fuel fraud method. Action: treat this as a security event and document it before clearing anything; inspect the pulser, its housing, seals and wiring for signs of interference or an added device; check for anything fitted between the pulser and the board that should not be there; check whether legitimate service work disturbed the pulser, which can trip it honestly; if tampering is suspected, preserve the evidence and escalate to the site owner rather than resetting; re establish security and verify calibration by proving the meter before returning to sale; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
A hardware fault has been detected. This is a general fault, so the log entries around it are more informative than the code itself. Action: read the surrounding event log entries, since they usually identify the actual subsystem; check which functions are unavailable, which localises the fault faster than testing everything; check power and all internal network connections; check for water ingress and corrosion in the enclosures; power cycle and see what fails to come up; work the specific fault that emerges rather than treating this code on its own
Event log entry recording that the blend ratio for product 1 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the blended grade after any ratio change, since the delivered product specification depends on it; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the blend ratio for product 2 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the blended grade after any ratio change, since the delivered product specification depends on it; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the blend ratio for product 3 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the blended grade after any ratio change, since the delivered product specification depends on it; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the blend ratio for product 4 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the blended grade after any ratio change, since the delivered product specification depends on it; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the blend ratio for product 5 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the blended grade after any ratio change, since the delivered product specification depends on it; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the blend ratio for product 6 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the blended grade after any ratio change, since the delivered product specification depends on it; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the blend ratio for product 7 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the blended grade after any ratio change, since the delivered product specification depends on it; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the blend ratio for product 8 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; prove the blended grade after any ratio change, since the delivered product specification depends on it; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the flow control setting for product 1 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify flow rate and delivery behaviour after the change; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the flow control setting for product 2 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify flow rate and delivery behaviour after the change; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the flow control setting for product 3 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify flow rate and delivery behaviour after the change; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the flow control setting for product 4 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify flow rate and delivery behaviour after the change; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the flow control setting for product 5 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify flow rate and delivery behaviour after the change; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the flow control setting for product 6 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify flow rate and delivery behaviour after the change; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the flow control setting for product 7 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify flow rate and delivery behaviour after the change; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the flow control setting for product 8 was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify flow rate and delivery behaviour after the change; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that automatic temperature compensation was enabled. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; confirm ATC is appropriate and permitted for this jurisdiction and product, since ATC affects billed volume; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that automatic temperature compensation was disabled. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; confirm the site is permitted to sell without ATC, since some jurisdictions require it; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the ATC base temperature value was changed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify the base value matches what your jurisdiction requires, since this directly changes billed volume; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that sealable switches were accessed. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; this is the entry Weights and Measures cares about most, so make sure it is accounted for in your service record; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the volume measurement unit was changed to litres. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify prices and calibration are consistent with the new unit before allowing sales, since a price left in the previous unit is a serious billing error; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the volume measurement unit was changed to gallons. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify prices and calibration are consistent with the new unit before allowing sales, since a price left in the previous unit is a serious billing error; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the volume measurement unit was changed to imperial gallons. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify prices and calibration are consistent with the new unit before allowing sales, since a price left in the previous unit is a serious billing error; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the volume measurement unit was changed to Hawaiian gallons. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify prices and calibration are consistent with the new unit before allowing sales, since a price left in the previous unit is a serious billing error; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
STP 3 is configured but is not connected. Action: check the STP control wiring and its terminations at the dispenser and at the controller; check the STP relay is present and operating; check the STP itself has power and is not locked out by a leak detector or a tank alarm; check whether a tank alarm or a line leak alarm has disabled the pump, which is a common cause that looks like a wiring fault; check the configuration expects this STP at all, and correct it if the position was decommissioned; confirm the pump runs and makes pressure once the fault clears
STP 4 is configured but is not connected. Action: check the STP control wiring and its terminations at the dispenser and at the controller; check the STP relay is present and operating; check the STP itself has power and is not locked out by a leak detector or a tank alarm; check whether a tank alarm or a line leak alarm has disabled the pump, which is a common cause that looks like a wiring fault; check the configuration expects this STP at all, and correct it if the position was decommissioned; confirm the pump runs and makes pressure once the fault clears
The programming says the vapour vacuum option is set, but the hardware says no VaporVac board is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The programming says the vapour vacuum option is not set, but the hardware says a VaporVac board is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The vapour vacuum option is set and connected. This is a status entry confirming the configuration and the hardware agree. Action: no repair is required if this is expected; confirm the VaporVac is actually operating rather than merely detected; if this appeared unexpectedly, check whether the configuration was recently changed and by whom; verify vapour recovery performance if the system was just commissioned or reconfigured
The VaporVac motor is not responding. Action: check the motor has power at its connector, which separates a drive fault from a motor fault; check the motor harness for damage and water; check the motor turns freely rather than being seized; check for liquid in the vapour path loading the motor; check the VaporVac board and its drive circuit; check the vapour hose for blockage, since a fully blocked path can stall the motor; record the outage for your local air district requirements
The programming says no valve is configured at this position, but the hardware says a valve is responding there. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The programming says the air sensor option is set, but the hardware says no air sensor is connected. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The ATC node is not communicating with the main board over the internal network. Anything that node controls is unavailable until the link is restored. Action: check the node has power and that its indicator behaves normally; check the network wiring and connectors to that node, including anything disturbed by recent work; check the node is correctly addressed and has not been duplicated with another node; check the node's software version matches what the main board expects; reseat the node and its connectors; power cycle the dispenser and see whether it enumerates; swap the node with a known good one of the same type to separate a node fault from a wiring fault
The programming says no ATC node is configured, but the hardware says an ATC node is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
A temperature compensating meter that the configuration expects is not connected. Action: check whether a T meter should be fitted at this position at all; check the harness and connector at the meter and the board; check the meter for damage or water ingress; if no T meter is fitted, correct the configuration rather than leaving the fault posted; if one is fitted, treat it as a wiring or device fault and test accordingly
More ATC probes are present than there are meters. The configuration and the hardware disagree. Action: count the probes physically fitted and the meters they are meant to serve; check the configuration for a duplicated or leftover probe entry, common after a rebuild; check whether a probe was fitted to a position that no longer has a meter; correct whichever side is wrong; verify ATC operation afterwards, since ATC affects billed volume
More meters are present than there are ATC probes. Some meters have no temperature compensation. Action: check which meter is missing its probe; check whether the probe is fitted but not detected, which makes this a wiring fault rather than a missing part; check the probe harness and connector; if ATC is required on this position, fit the probe, and if it is not, correct the configuration; verify ATC operation afterwards, since this directly affects billed volume
No pulse train is being received from a temperature compensating meter that reports as connected. Action: check the T meter harness and connector at both ends; check the meter is actually turning, since no flow produces no pulses; check the pulser element on the T meter for damage or contamination; check the configuration expects the correct number of T meters; check for noise on the signal wiring; swap with a known good unit to separate meter from wiring
The door node is not communicating with the main board over the internal network. Anything that node controls is unavailable until the link is restored. Action: check the node has power and that its indicator behaves normally; check the network wiring and connectors to that node, including anything disturbed by recent work; check the node is correctly addressed and has not been duplicated with another node; check the node's software version matches what the main board expects; reseat the node and its connectors; power cycle the dispenser and see whether it enumerates; swap the node with a known good one of the same type to separate a node fault from a wiring fault
A software download to the door node failed with a flash error. The node may be left in an incomplete state. Action: do not leave the node part programmed, repeat the download to completion; check the supply is stable, since an interruption during flash writing causes this; check the network connection to the node is solid before retrying, not intermittent; confirm you are loading the correct version for this node; if flash fails again after a clean retry, the node hardware is suspect; verify node configuration after a successful download
A software download to the door node did not complete. Action: repeat the download and let it finish without interruption; check for anything interrupting the process, including power events and network faults; check the network wiring and connectors to the node; confirm the version being loaded is correct for this node; verify node configuration and operation afterwards
The PPU board is not communicating with the main board over the internal network. Anything that node controls is unavailable until the link is restored. Action: check the node has power and that its indicator behaves normally; check the network wiring and connectors to that node, including anything disturbed by recent work; check the node is correctly addressed and has not been duplicated with another node; check the node's software version matches what the main board expects; reseat the node and its connectors; power cycle the dispenser and see whether it enumerates; swap the node with a known good one of the same type to separate a node fault from a wiring fault
The programming says no PPU board is configured, but the hardware says a PPU board is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The pump handle input is not connected to the PPU board. The dispenser cannot tell when the handle is lifted. Action: check the handle switch harness and connector at both ends; check the hang up switch itself for damage and for water; check the harness for a break where it flexes, which is where these normally fail; check the configuration expects a handle at this position; test the switch operation directly before replacing the board
The grade select button input is not connected to the PPU board. Action: check the button harness and connector at both ends; check the button itself and its contacts; check for water in the connector; check the configuration expects grade select buttons at this position; test the button directly to separate the switch from the harness
The manager keypad key is reading as continuously pressed. The dispenser will not behave normally while an input is held. Action: check the button physically for anything holding it in, ice, dirt, a swollen gasket or a damaged bezel; check the button is not being pressed by a distorted or over tightened panel; disconnect the button at its connector, and if the fault clears the button or its cable is at fault, if it persists the input on the board is at fault; check the harness for a pinched or chafed conductor shorting to ground; check for water in the connector, which is the most common cause on outdoor units; replace the switch or the harness as the test indicates
The programming says the PPP keypad option is set, but the hardware says no PPP keypad is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The programming says the PPP keypad option is not set, but the hardware says a PPP keypad is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The PPP keypad key is reading as continuously pressed. The dispenser will not behave normally while an input is held. Action: check the button physically for anything holding it in, ice, dirt, a swollen gasket or a damaged bezel; check the button is not being pressed by a distorted or over tightened panel; disconnect the button at its connector, and if the fault clears the button or its cable is at fault, if it persists the input on the board is at fault; check the harness for a pinched or chafed conductor shorting to ground; check for water in the connector, which is the most common cause on outdoor units; replace the switch or the harness as the test indicates
The programming says the call button option is set, but the hardware says no call button is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The programming says the call button option is not set, but the hardware says a call button is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The call button is reading as continuously pressed. The dispenser will not behave normally while an input is held. Action: check the button physically for anything holding it in, ice, dirt, a swollen gasket or a damaged bezel; check the button is not being pressed by a distorted or over tightened panel; disconnect the button at its connector, and if the fault clears the button or its cable is at fault, if it persists the input on the board is at fault; check the harness for a pinched or chafed conductor shorting to ground; check for water in the connector, which is the most common cause on outdoor units; replace the switch or the harness as the test indicates
The programming says the emergency stop option is set, but the hardware says no E stop is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The programming says the emergency stop option is not set, but the hardware says an E stop is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The programming says the push to start option is set, but the hardware says no push to start button is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The programming says the push to start option is not set, but the hardware says a push to start button is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The push to start button is reading as continuously pressed. The dispenser will not behave normally while an input is held. Action: check the button physically for anything holding it in, ice, dirt, a swollen gasket or a damaged bezel; check the button is not being pressed by a distorted or over tightened panel; disconnect the button at its connector, and if the fault clears the button or its cable is at fault, if it persists the input on the board is at fault; check the harness for a pinched or chafed conductor shorting to ground; check for water in the connector, which is the most common cause on outdoor units; replace the switch or the harness as the test indicates
Manager keypad mode was exited by a power failure rather than normally. Changes in progress may not have been saved. Action: check whether any configuration change was part way through when power was lost; verify prices and settings against your records rather than assuming they saved; check the supply, since this indicates a power event at the dispenser; re enter anything that did not save and confirm it this time; check terminations and the power supply if this repeats
The totalizer node is not communicating with the main board over the internal network. Anything that node controls is unavailable until the link is restored. Action: check the node has power and that its indicator behaves normally; check the network wiring and connectors to that node, including anything disturbed by recent work; check the node is correctly addressed and has not been duplicated with another node; check the node's software version matches what the main board expects; reseat the node and its connectors; power cycle the dispenser and see whether it enumerates; swap the node with a known good one of the same type to separate a node fault from a wiring fault
The programming says no totalizer node is configured, but the hardware says a totalizer node is present. The dispenser is not reporting a failure so much as a disagreement between how it is configured and what is actually fitted. Action: establish which side is wrong, the programming or the hardware, before changing anything; check the configuration for this dispenser against what is physically installed; if the hardware should be there, check it is connected, powered and seated, and check its harness and connector; if the hardware was deliberately removed or was never fitted, correct the programming instead; check whether recent work, a board swap or a software update reset the configuration; recheck after a power cycle, and confirm the fault clears rather than assuming it
The totalizer is present but no return pulse is being detected, so totals are not being recorded. Action: check the totalizer harness and connector at both ends; check the totalizer mechanism is actually driven and turning; check for a damaged or chafed conductor in the harness; check the configuration matches the totalizer type fitted; swap with a known good unit to separate the device from the wiring; reconcile totals afterwards, since anything dispensed while this was active may not be recorded
The measurement unit changed and is not programmed. The dispenser is in an inconsistent state between units. Action: set the measurement unit correctly and completely before allowing sales; verify calibration after the change, since unit changes and calibration interact; verify prices are expressed in the correct unit, because a price left in the old unit is a serious billing error; prove the meter before returning to sale; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Event log entry recording that the measurement unit was set to 500 pulses per gallon. This is an audit record, not a fault. It exists because the setting is metrologically significant and Weights and Measures requires the change to be traceable. Action: check the date and time of the entry against your own service records; if you or another agent made the change, this is expected and needs no repair, just documentation; if nobody can account for it, treat it as unauthorised access to sealed settings and investigate who had the door open; verify the pulser fitted actually matches this setting, since a mismatch between the pulser and the programmed rate makes every measurement wrong; verify the current value is correct before returning the dispenser to service; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
The database failed its integrity check. Data the dispenser relies on cannot be trusted. Action: record the current totals and configuration before doing anything, because recovery may clear them; power cycle and see whether the fault clears on a clean start; check for an unstable supply or repeated power interruptions, which is the usual root cause of corruption; check for a recent interrupted software download; reload the database from the site controller if the dispenser supports it; verify every price, grade and configuration value afterwards rather than assuming the reload was complete; if it recurs the board is suspect, so escalate rather than repeatedly reloading
The database build process has started. This is a status entry rather than a fault. Action: let the process complete without interrupting it or removing power; verify configuration, prices and calibration once it finishes, since a rebuild can restore defaults; establish why a rebuild was triggered if nobody initiated it, because that points at corruption or a power event; prove the meter if calibration was affected
A database unit was forced. Someone or something overrode the stored unit setting. Action: establish whether this was deliberate, since a technician forcing a unit is a normal recovery step; verify the unit now in force is correct for the jurisdiction; verify calibration and prices are consistent with that unit; prove the meter before returning to sale; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
A database read failed or returned wrong data. Action: record what configuration can still be read; power cycle and see whether the read succeeds on a clean start; check the supply for instability; reload the database if the dispenser supports it, then verify every value; if reads keep failing the memory or board is failing, so escalate rather than repeatedly reloading
A database write failed, so a change was not stored. Whatever was being set is not saved. Action: assume the change did not save and verify it rather than trusting the entry screen; re enter the value and confirm it persists across a power cycle; check the supply for instability during writes; check for a failing memory device if writes keep failing; verify all related settings, since a failed write can leave a partial change
The customer interface door node configuration was not received. The node came up without knowing how it should behave. Action: power cycle and let the configuration transfer again; check the network wiring and connectors to the door node; check the node's addressing and software version; check whether a recent board swap or software update interrupted the transfer; reseat the node; verify the customer interface behaves correctly afterwards rather than assuming the transfer worked
The pump handle is not connected correctly for the configured PPU option. The wiring and the programming disagree about how the handle is arranged. Action: check the handle wiring against the configured PPU option; check which input the handle is landed on and whether it matches the configuration; check whether a recent change to the PPU option left the wiring behind; correct whichever side is wrong; test handle operation on every grade after correcting
The ATC node is running a software version the main board does not expect. Behaviour is unpredictable, and on an ATC node that means billed volume is unpredictable. Action: take the position out of sale until the versions agree, since this affects measurement; check the node's version against the main board's requirement; check whether a recent board swap brought the wrong version in; load the correct version and let it complete without interruption; verify ATC operation and prove the meter before returning to sale; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
The door node is running a software version the main board does not expect. Behaviour is unpredictable, and on an door node that means billed volume is unpredictable. Action: take the position out of sale until the versions agree, since this affects measurement; check the node's version against the main board's requirement; check whether a recent board swap brought the wrong version in; load the correct version and let it complete without interruption; verify ATC operation and prove the meter before returning to sale; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
The totalizer node is running a software version the main board does not expect. Behaviour is unpredictable, and on an totalizer node that means billed volume is unpredictable. Action: take the position out of sale until the versions agree, since this affects measurement; check the node's version against the main board's requirement; check whether a recent board swap brought the wrong version in; load the correct version and let it complete without interruption; verify ATC operation and prove the meter before returning to sale; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
The MIP node is running a software version the main board does not expect. Behaviour is unpredictable, and on an MIP node that means billed volume is unpredictable. Action: take the position out of sale until the versions agree, since this affects measurement; check the node's version against the main board's requirement; check whether a recent board swap brought the wrong version in; load the correct version and let it complete without interruption; verify ATC operation and prove the meter before returning to sale; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
The ATC node failed to subscribe to the network, so it is present but not participating. Action: power cycle and let the network re enumerate; check the node's addressing and software version; check the network wiring and connectors to the node; check for a duplicate address elsewhere on the network; reseat the node; confirm ATC is actually operating afterwards rather than just that the fault cleared
The door node failed to subscribe to the network, so it is present but not participating. Action: power cycle and let the network re enumerate; check the node's addressing and software version; check the network wiring and connectors to the node; check for a duplicate address elsewhere on the network; reseat the node; confirm the door node functions afterwards rather than just that the fault cleared
The totalizer node failed to subscribe to the network, so it is present but not participating. Action: power cycle and let the network re enumerate; check the node's addressing and software version; check the network wiring and connectors to the node; check for a duplicate address elsewhere on the network; reseat the node; confirm totals are being recorded afterwards rather than just that the fault cleared
The two wire converter has faulted. Everything downstream of it loses communication. Action: check the converter has power and that its indicators behave normally; check the wiring and terminations on both the two wire side and the controller side; check for water and corrosion at the converter, which is often mounted where it gets wet; check whether other dispensers on the same converter are also down, which confirms the converter rather than one dispenser; power cycle the converter; swap in a known good converter to confirm before ordering parts
The pump was updated with data from door node storage. The dispenser has taken configuration from its backup copy. Action: verify the restored data is actually current rather than assuming the backup was up to date; check prices, grade mapping and calibration against your records; establish why the primary data was lost, commonly a board swap, corruption or a power event; prove the meter before returning to sale if calibration data was among what was restored; Breaking a Weights and Measures seal to reach calibration is restricted to a registered service agent in most states, so confirm you are permitted before opening it, and arrange resealing and any required W&M notification afterwards
Reference notes from DropTubeBuilder, the offline field tool for fuel system technicians who cut overfill drop tubes, build tank charts and chase dispenser faults. It works with no cell signal, because the sites do not have any.
Get DropTubeBuilder on the App StoreThese notes are a field aid, not a substitute for the governing codes, the stamped drawings, the authority having jurisdiction, or manufacturer manuals. Verify against the current documentation for your installed equipment.