Fault finding and diagnosis
Worcester 2000 – 6 721 814 551 (2019/09)
66
264 B Air feed failed during operating phase. ▶ Reconnect the fan plug properly, perform reset.
▶ Replace fan.
▶ Mains voltage must correspond to the default value.
▶ Remove any blockages in the flue system.
▶ Check venturi/injector for potential blockage.
265 BC Heat energy demand lower than energy
supplied.
–
268 – Component test mode. Not applicable, is status message.
269 V Flame monitoring. ▶ Reset appliance electronics - factory reset.
▶ Replace the appliance electronics.
▶ Check flame sense electrodes and connections.
▶ Check earth connections.
270 BC The heat source has started up. –
273 O Operation interrupted: safety inspection
following 24 hours of continuous operation.
–
275 O Test code plug detected. –
281 – Pump stuck or running dry. ▶ Replace the pump.
▶ Vent the system.
▶ Check operating pressure.
▶ Check low pressure switch.
▶ Check pump connections (hydraulic and electrical).
305 BC Boiler cannot start temporarily following DHW
priority.
System appliance only.
306 V After switching gas off: Flame is detected. ▶ Check the gas valve, replace if required.
▶ Check electrodes and connecting leads, replace if required.
▶ Replace the appliance electronics.
323 – Control communication fault. –
328 V Mains voltage briefly interrupted. ▶ Check for voltage interruption between electrical wiring system of the building and
the appliance.
341 B Heat source temperature increase too rapid. ▶ Open isolation valves.
▶ Connect plug to pump.
▶ Replace pump.
▶ Ensure circulating pump is set on Constant speed mode - curve III.
342 BC Temperature increase in DHW mode too rapid. ▶ If the water pressure is too low, top up with water and vent the system.
▶ Open service valves in the cylinder charging circuit.
▶ Replace the diverter valve / cylinder primary pump.
350 B Flow temperature sensor short circuit. ▶ Check and replace flow temperature sensor and harness Section 13.2.1.
▶ Check and replace the connecting lead to the flow temperature sensor.
▶ Check and replace control unit/burner control unit.
351 B Flow temperature sensor failure. ▶ Connect the plug to the flow temperature sensor.
▶ Check and replace flow temperature sensor and harness Section 13.2.1.
▶ Check and replace the connecting lead to the flow temperature sensor.
▶ Check and replace control unit/burner control unit.
356 B Supply voltage for heat source too low. ▶ Establish supply voltage of at least 196 VAC.
357 BC Venting program –
358 BC Active anti-seizing function. Blocking protection for the heating pump and diverter valve active
360 V Incorrect code plug. ▶ Check code plug, replace if necessary.
362 V Service code plug detected. ▶ Check code plug, replace if necessary.
363 V System fault, appliance electronics: fault when
testing the ionisation signal.
▶ Check earthing connections.
▶ Reset appliance electronics, replace if necessary.
364 V Solenoid valve EV2 leaking. ▶ Check the gas valve, replace if required.
▶ Check electrodes and connecting leads, replace if required.
▶ Check and replace the appliance electronics.
365 V Solenoid valve EV1 leaking. ▶ Check the gas valve, replace if required.
▶ Check electrodes and connecting leads, replace if required.
▶ Check and replace the appliance electronics.
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