Fault finding and diagnosis
Worcester 2000 – 6 721 814 551 (2019/09)
70
2953 B No flame signal with low output. The burner starts automatically after cleaning (purge).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 CO
2
values.
▶ Check Flue integrity.
▶ Check flue terminal.
2955 B The heat source does not support the specified
parameters for the hydraulic configuration.
▶ Check hydraulic configuration, correct if necessary.
▶ Check menu L2, default setting 0 required.
2956 O Hydraulic configuration at the heat source is
activated.
–
2957
2958
V
V
System fault, appliance electronics. ▶ Reset appliance electronics.
▶ Check electrical connections.
▶ Check and replace the control unit.
2959
2960
B
B
System fault, appliance electronics. ▶ Check and replace the control unit and code plug.
2961
2962
V
V
No signal from fan. ▶ Check mains voltage to fan.
▶ Check fan harness for continuity, replace if required.
▶ Check the Pulse width modulation (PWM).
▶ Check and replace the fan.
▶ Check and replace the PCB.
2963 R The signal from the heat exchanger temperature
limiter and flow temperature sensor is outside
the permissible range.
▶ Check flow through appliance and system is filled.
▶ Check for air locks in the system. Purge if required.
▶ Check Heat exchanger sensor (primary thermistor) and plug connected to stat.
▶ Check resistance of stat. Replace if required.
▶ Check continuity of harness. Replace if required.
2964 B Insufficient flow rate in heat exchanger. ▶ Supply sensor is not assembled on the supply pipe.
▶ Supply sensor does not make proper contact to the supply pipe.
▶ System is not filled with water.
▶ No water flow, because CH system is closed.
▶ No water flow, because pump is not operating correctly.
2965 B Flow temperature too high. ▶ Check flow through appliance and system pressure.
▶ Check for air locks in the system. Purge if required.
▶ Check isolation valves.
2966 B Flow temperature increase in heat exchanger
too rapid.
▶ Check flow through appliance and system pressure.
▶ Check for air locks in the system. Purge if required.
▶ Check isolation valves.
▶ Check pump is operating freely, check voltage to pump
2967 B Temperature differential between flow
temperature sensor and heat exchanger
temperature limiter is too great.
▶ Check flow through appliance and system filled.
▶ Check for air locks in the system. Purge if required.
▶ Check isolation valves.
▶ Check pump is operating, check voltage to pump.
▶ Check heat exchanger sensor and flow sensor are making contact with the pipe
work.
▶ Check heat exchanger sensor and resistance of stat. replace if required.
▶ Check continuity of harness. Replace if required.
2968 – Refilling of system in progress. Not applicable in the UK/IE
2969 – Maximum number of refills reached. Not applicable in the UK/IE
2971 V Operating pressure too low. ▶ Vent the heating system.
▶ Check water pressure, if necessary top up the system pressure.
▶ Check pressure sensor, replace if required.
2972 V Mains voltage too low. ▶ Check mains supply voltage on appliance L and N connections.
Fault
code
Fault
category
Description Remedy
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