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Section “Active errors” lists the codes of current faults detected by the controller. If the cause of the
fault is eliminated, the entry is moved to the “Error records” section. In other words, this means that a
defect had been detected, but it is not currently active.
A “Delete” button for erasing recorded controller errors from the memory is located in the bottom part
of the “Errors” tab, below the “Error records” section.
The following errors may appear during operation:
Description in AC STAG application Meaning
Gas injector missing Open circuit or fault of the specified gas injector
Low gas pressure Gas pressure dropped or kept below the allowed low
limit within the specified time
High gas pressure Gas pressure 2x higher than the operating pressure for
60 seconds (usually associated with reducer problems)
Supply voltage too low
Controller supply voltage decreased below 9 [V] (usually
associated with a failing battery)
Gas temperature sensor missing
Disconnected or disrupted circuit of the gas temperature
sensor
Reducer temperature sensor missing Disconnected or disrupted circuit of the reducer
temperature sensor
Gas temperature sensor circuit
shorted
Gas temperature sensor shorted to vehicle grounding
Reducer temperature sensor circuit
shorted Reducer temperature sensor shorted to vehicle
grounding
Injector supply circuit failure
Controller’s circuit for injectors supply failed
Solenoid valve supply circuit failure
Overloaded or defective circuit or solenoid supply
Solenoid valve missing
Disconnected or disrupted circuit of the solenoid supply
Peripherals supply circuit failure Overloaded circuit of peripherals supply (PS-02 sensor,
WPG-H gas level indicator)
Connection with the switch failed LED 400/LED 401 switch not connected
Communication with the switch lost Connection with LED 400/LED 401 switch interrupted
Failure /overload of AUX_12V circuit
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AUX 12V circuit is overloaded or short-circuited to the
ground (connected load is too high).
Short-circuit or failure of the supply
circuit for gas level indicator
5
Gas level indicator (WPG) circuit is overloaded or short-
circuited to the ground (connected load is too high).
Short-circuit in manifold pressure
sensor
Manifold pressure sensor shorted to vehicle ground.
No manifold pressure sensor
Not connected or open circuit of manifold pressure
sensor.
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applies to new hardware controllers (STAG-300 QMAX PLUS, STAG-4 QNEXT PLUS, STAG-4 QBOX PLUS
from version 3/B0)