Fault finding and diagnosis
77
Greenstar 4000 – 6 720 891 162 (2020/09)
2951 V
Loss of flame too many times
Maximum unexpected flame losses exceeded.
▶ Refer to the blocking error(s) that lead to this locking error. Check the fault history on
appliance.
▶ Possible incomplete purging of gas pipe.
▶ Could also indicate a wide variety of issues such as undersized pipework or gas
pressure dropping off, incorrectly routed condensate discharge, incorrectly sited
flues, incorrectly wired etc.
2952 V
Internal fault when testing the ionisation
signal
▶ Perform reset.
▶ If fault persists, replace control unit.
2957 V
Boiler electr. system fault
▶ Reset appliance electronics (factory reset).
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Replace the control unit.
2961 V
No fan signal available
▶ Check the mains voltage to the fan.
▶ Check the fan harness for continuity and replace if required.
▶ Check the pulse width modulation (PWM).
▶ Replace the fan.
▶ Replace the PCB.
2962 V
No fan signal available
▶ Check the mains voltage to the fan.
▶ Check the fan harness for continuity and replace if required.
▶ Check the pulse width modulation (PWM).
▶ Replace the fan.
▶ Replace the PCB.
2963 B
The heat exchanger sensor or both supply
and heat exchanger sensors are defect
▶ Check the flow through the appliance and 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
temperature sensor.
▶ Check the resistance of the temperature sensor and replace if required.
▶ Check the continuity of the temperature sensor harness and replace if required.
2964 B
Flow rate in heat exchanger too low
▶ 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.
2965 B
Flow temperature too high
▶ System is not filled with water.
▶ No water flow, because CH system is closed.
▶ No water flow, because pump is not operating correctly.
▶ Check flow through appliance and system pressure.
▶ Check for air locks in the system. Purge if required.
▶ Check isolation valves.
2966 B
Flow temperature rise in heat exchanger too
rapid
▶ System is not filled with water.
▶ No water flow, because CH system is closed.
▶ No water flow, because pump is not operating correctly.
▶ Check pump is operating freely check voltage to pump.
▶ Check the isolation valves.
▶ Check for air locks in the system, purge if required.
▶ Check flow through appliance and system pressure.
2967 B
The temperature difference between supply
temperature sensor and temperature
sensor at heat exchanger is too large
▶ 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 isolation valves, ensure they are open.
▶ Check the pump is operating freely and check the voltage to the pump.
▶ Check the heat exchanger sensor and the flow sensor are making correct contact with
the heat exchanger assembly/pipework.
▶ Check the heat exchanger sensor for break or short circuit, replace if required.
▶ Check the resistance of the supply sensor for break or short circuit, replace if required.
▶ Check the continuity of harness, replace if required.
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ry Fault text on the display, description
Remedy
