Fault finding and diagnosis
Greenstar 2000 – 6 721 820 552 (2021/02)
82
2950 B
No flame signal following starting procedure ▶ Check the CO
2
settings and adjust.
▶ Check the burner and the heat exchanger gaskets.
▶ Check the gas pressure during burning at full load.
2951 V
Loss of flame too many times
Note: Front cover sealing issues can cause this fault.
▶ Refer to blocking errors(s) that lead to this locking error. Check the fault history on the
appliance.
▶ Possibly the purging of the gas pipe is incomplete.
▶ It could also indicate a wide variety of issues such as pipework undersized or gas
pressure dropping off, incorrectly routed condens drains, incorrectly sited flues,
incorrectly wired etc.
2952 V
Internal fault when testing ionisation signal ▶ Restart the appliance to see if the problem re-occurs.
▶ If the fault remains after resetting: the burner controller (PCB) is defective.
2953 B
No flame signal with low output.
The burner starts automatically after purging. Possible cause high winds.
▶ If the fault occurs repeatedly, check the settings of the CO
2
values.
▶ Check flue integrity.
▶ Check flue terminal.
2954 B
No flame signal with high output.
Burner restarts automatically after purging.
▶ Check and replace burner gaskets.
▶ Reduce burner load.
▶ If the fault occurs repeatedly, check the settings of the CO2 values.
▶ Check flue integrity.
▶ Check flue terminal.
2955 B
Boiler does not support the parameters set
for the hydraulic configuration
Verify that the following settings are correct. This can only be reset by powering off the
appliance.
▶ Low loss header setting = OFF
▶ Internal DHW hydraulic = 1/ON
▶ Heat circuit 1 hydraulic = 1/ON
▶ CH hydraulic = 1/ON
2956 O
Hydraulic configuration at the boiler
activated
Verify that the following settings are correct. This can only be reset by powering off the
appliance.
▶ Low loss header setting = OFF
▶ Internal DHW hydraulic = 1/ON
▶ Heat circuit 1 hydraulic = 1/ON
▶ CH hydraulic = 1/ON
2957 V
Internal burner control error
▶ Restart the appliance to see if the problem re-occurs.
▶ If the fault remains after resetting: the burner controller (PCB) is defective and must be
replaced.
2958 V
System fault, appliance electronics.
▶ Reset appliance electronics.
▶ Check electrical connections.
▶ Check and replace the control unit.
2959 B
System fault, appliance electronics.
▶ Check and replace the control unit and code plug, if fitted.
2960 B
System fault, appliance electronics.
▶ Check and replace the control unit and code plug, if fitted.
2961 V
No fan signal available
▶ Check the mains voltage to the fan.
▶ Check the fan harness for continuity and replace if required.
▶ Replace the fan.
▶ Replace the PCB.
2962 V
Fan not running
▶ Check the mains voltage to the fan.
▶ Check the fan harness for continuity and replace if required.
▶ Replace the fan.
▶ Replace the PCB.
2963 B
Signal from flow and heat exchanger
temperature sensor outside the permissible
range
▶ Check the flow through the appliance and that the system is filled.
▶ Check for air locks in the system and purge if required.
▶ Check the heat exchanger sensor (primary thermistor) and the plug connected to the
temperature sensor.
▶ Check the resistance of the temperature sensor and replace if required.
▶ Check the continuity of the harness and replace if required.
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