Fault finding and diagnosis
69
Worcester 2000 – 6 721 814 551 (2019/09)
2927 B No flame detected during ignition. ▶ Check the main shut-off valve, open if necessary.
▶ Check the appliance isolation valve, open if necessary.
▶ Measure the gas supply pressure at the rated heat input. If necessary, shut down
the appliance and check the gas line.
▶ Check flame sense electrode and connecting lead, replace if required.
▶ Check venturi/injector for potential blockage.
▶ Measure the ionisation current.
▶ Check the protective conductor connection in the control unit.
▶ Check the ignition cable for damage, replace if necessary.
▶ Check functionality of gas valve and replace if necessary.
▶ Check burner setting value at rated heat input.
▶ Check burner setting value at the lowest output.
▶ Check flue system.
▶ Check combustion air supply.
▶ Check the heat exchanger on the flue gas side for deposits, clean if necessary.
2932 – Internal fault. ▶ Restart the appliance.
2928
2930
2931
2940
V
V
V
V
Internal fault in burner control unit. ▶ Reset appliance - factory reset.
▶ If the fault persists following a reset, the burner control unit is faulty and must be
replaced.
2941 B Insufficient flow rate in heat source. ▶ Check plug of flow temperature sensor, connect correctly if required.
▶ Check flow temperature sensor, replace if necessary.
▶ Check pump for blockage, clear if required.
▶ Check pump settings, correct if required.
▶ Check water pressure, if necessary top up until the preset pressure is reached.
2942 – No fan speed feedback. ▶ Connect plug for speed control to the fan.
▶ Connect plug for power supply to the fan.
▶ Check fan harness.
▶ Check and replace control unit.
2943 – Mains voltage too low. ▶ Establish supply voltage of at least 196 VAC.
2945 V Too many short heat demands in a short time. ▶ Reset appliance - factory reset.
▶ Increase restart blocking time.
▶ Make sure that at least one thermostatic valve is open.
▶ Check and replace faulty heating pump.
▶ Check diverter valve functionality, replace if necessary.
2946 V Incorrect code plug. ▶ Check code plug, replace if necessary.
2947 R Anti-seizing function is activated. The function stops automatically.
2948 B No flame signal with low output. The burner restarts automatically after purging.
▶ Check CO
2
settings.
2949 B No flame signal with high output. The burner restarts automatically after purging.
▶ Check burner gaskets, replace if required.
▶ Check CO
2
settings.
2950 B No flame signal following starting procedure. ▶ Check CO
2
settings, adjust if necessary.
▶ Check Burner and heat exchanger gaskets
▶ Check gas pressure during burning at full load
▶ Burner restarts automatically after purging
2951 V Loss of flame too frequent. ▶ Refer to the blocking error(s) that lead to this locking error. Check the fault history
on appliance.
▶ Possible purging of gas pipe incomplete.
▶ Could also indicate a wide variety of issues such as pipework undersized or gas
pressure dropping off, incorrectly routed condense drains, incorrectly sited flues,
incorrectly wired etc.
2952 V Internal fault when testing the ionisation signal. ▶ Restart appliance to see if problem re-occurs.
▶ If the fault remains after resetting, the burner controller (PCB) is defective
Fault
code
Fault
category
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