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Fault finding and diagnosis
Description
2924 V
No feedback from the gas valve
2925 V
Too low feedback from the modulating gas
valve
2926 V
Too high feedback from the modulating/
current controlled gas valve
2927 B
Flame failed during operation
2928 –
Internal error
2930 V
System fault heat exchanger electronics /
basic controller
2931 –
Illegal instruction executed by
microcontroller
2940 V
Low voltage
2946 V
Incorrect code plug detected
2948 B
No flame signal with low output
2949 B
No flame signal with high output
2950 B
No flame signal following starting procedure ▶ Check the CO
92
Remedy
▶ Check the voltage to the gas valve.
▶ Check the resistance of the gas valve coils.
▶ Check the continuity of harness and replace if required.
▶ The gas valve or the PCB may have a fault.
▶ Check gas valve cable and connectors.
▶ Check the voltage to the gas valve.
▶ Check the resistance of the gas valve coils.
▶ Check the continuity of harness and replace if required.
▶ Check the voltage to the gas valve.
▶ Check the resistance of the gas valve coils.
▶ Check the continuity of harness and replace if required.
▶ The gas valve or the PCB may have a fault.
▶ Check the gas supply to the property and the inlet on the gas valve (check drop on inlet)
and replace if required.
▶ Check the flame sense probe and the ignition transformer to the heat exchanger.
▶ Check the voltage to the gas valve and the continuity of harness and replace if required.
▶ Check the condition of the bearing plate and back-flow prevention valve between the
fan and the burner.
▶ Check the flame sense plug is connected and the continuity of harness and replace if
required.
▶ Check the condensate trap and the discharge route.
▶ Check the flue integrity ( Chapter 9.6, page 54).
▶ Restart the appliance to see if the problem re-occurs.
▶ If the fault remains after resetting: the burner controller (PCB) is defective.
▶ Perform a factory reset on the appliance to see if the problem re-occurs.
▶ If the fault persists following a reset, the control unit is faulty and must be replaced.
▶ Restart the appliance to see if the problem re-occurs.
▶ If the fault remains after resetting: the burner controller (PCB) is defective.
▶ Perform a factory reset on the appliance to see if the problem re-occurs.
▶ Restart the appliance to see if the problem re-occurs.
▶ If the fault remains after resetting: the burner controller (PCB) is defective.
If code plug is present:
▶ Check that correct plug is inserted.
▶ Check the code plug is not damaged.
▶ Check code plug against the part number.
▶ Replace the code plug if required.
If code plug is not present:
▶ Check appliance electronics (PCB), replace if necessary.
The burner starts automatically after purging. It may cause strong winds.
▶ If the fault occurs repeatedly: check the settings of the CO
▶ Check the flue integrity.
▶ Check the flue terminal.
It may cause strong winds or flue gas recirculation. The burner starts automatically after
purging.
▶ Check the flue integrity.
▶ Check the flue terminal position.
▶ Check the CO
settings and adjust.
2
▶ Check the burner door lip seal and the inner flue gaskets.
▶ Check the gas pressure during operation at full load (working pressure, dropping low).
settings and adjust.
2
▶ Check the burner and the heat exchanger gaskets.
▶ Check the gas pressure during operation at full load.
values.
2
Greenstar 1000 – 6721835943 (2023/08)
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