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Description
2951 V
Loss of flame too many times
2952 V
Internal fault when testing ionisation signal ▶ Restart the appliance to see if the problem re-occurs.
2955 B
Heat exchanger does not support the
parameters set for the hydraulic
configuration
2956 O
Hydraulic configuration at the heat
exchanger activated
2957 V
Internal control error
2958 V
System fault, appliance electronics
2959 B
System fault, appliance electronics
2960 B
System fault, appliance electronics
2961 V
No fan signal available
2962 V
Fan not running
2963 B
Signal from flow and heat exchanger
temperature sensor outside the permissible
range
2964 B
Flow rate in heat exchanger too low
2965 B
Flow temperature too high
2966 B
Flow temperature rise in heat exchanger too
rapid
Greenstar 1000 – 6721835943 (2023/08)
Remedy
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.
▶ If the fault remains after resetting: the burner controller (PCB) is defective.
Verify that the following settings are correct. This can only be reset by powering off the
appliance.
▶ Internal DHW hydraulic = 1/ON
▶ Heat circuit 1 hydraulic = 1/ON
▶ CH hydraulic = 1/ON
Verify that the following settings are correct. This can only be reset by powering off the
appliance.
▶ Internal DHW hydraulic = 1/ON
▶ Heat circuit 1 hydraulic = 1/ON
▶ CH hydraulic = 1/ON
▶ Restart the appliance to see if the problem re-occurs.
▶ If the fault remains after resetting: the controller (PCB) is defective and must be
replaced.
▶ Perform factory reset.
▶ Check electrical connections.
▶ Check and replace the control unit.
▶ Check and replace the control unit and code plug, if fitted.
▶ Check and replace the control unit and code plug, if fitted.
▶ Check the mains voltage to the fan.
▶ Check the fan harness for continuity and replace if required.
▶ Replace the fan.
▶ Replace the control unit.
▶ Check the mains voltage to the fan.
▶ Check the fan harness for continuity and replace if required.
▶ Replace the fan.
▶ Replace the control unit.
▶ 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.
▶ 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.
▶ Check the flow through the appliance and the system is filled.
▶ Check for the air locks in the system and purge if required.
▶ Check the isolation valves.
▶ Check the flow through the appliance and the system is filled.
▶ Check for the air locks in the system and purge if required.
▶ Check the isolation valves.
▶ Check the pump is operating freely and check the voltage to the pump.
Fault finding and diagnosis
93
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