Fault finding and diagnosis
67
Worcester 2000 – 6 721 814 551 (2019/09)
604 V System fault, burner control unit. ▶ Reset appliance - factory reset.
▶ If the fault persists following a reset, the burner control unit is faulty and must be
replaced.
810 – DHW temperature has not increased for 2 hours. ▶ Prevent water from escaping.
▶ Position DHW temperature sensor correctly.
▶ If no voltage can be measured, then the MC10 control panel is faulty and must be
replaced.
▶ If power is being supplied to the DHW cylinder charge pump but it is still not
running, it is faulty and must be replaced.
▶ If power cannot be supplied to the DHW cylinder charge pump, then there is a
problem in the cable between the control panel and pump. Check screw terminals
and cables.
▶ If current is not being supplied to the 3-way valve, there is a problem in the cable
between the control panel and valve. Check screw terminals and cables.
▶ If current is being supplied to the 3-way valve but it is still not working, the valve is
faulty and must be replaced.
▶ If a voltage of approx. 230 V is measured at the terminals and the pump is not
running, the pump is faulty and must be replaced.
▶ Eliminate all faults in the cables. Vent if necessary.
▶ Replace the pump if there are any deviations whatsoever.
▶ Set the DHW heating to “Priority”.
▶ If readings are different to the values in the table, replace the sensor.
815 R Faulty low loss header temperature sensor. ▶ Check the sensor port.
▶ Check the temperature sensor for incorrect installation position or breakage.
1013 R Maximum combustion point reached. ▶ Check plausibility of displayed cylinder temperature.
▶ Check plug-in connectors and cable harness for contact.
▶ Replace cylinder temperature sensor.
1014 – Ionisation current is too low. –
1017 R Water pressure too low. ▶ Check water pressure, if necessary top up until the preset pressure is reached.
▶ Check pressure sensor, replace if required.
1018 W Service time expired. ▶ Carry out maintenance.
1021 R DHW temperature sensor faulty. ▶ Check plug, connect correctly.
▶ Check installation position of temperature sensor, mount correctly if required.
▶ Check temperature sensor, replace if necessary ( Tab. 36, page 75).
▶ Check connecting lead for breaks or short circuits, replace if required.
▶ Check and replace the appliance electronics.
1022 – DHW temperature sensor is faulty. –
1023 R Maximum operation time including standby is
reached.
▶ Perform inspection.
1065 R Pressure sensor faulty or not connected. ▶ Check plug, connect correctly.
▶ Check pressure sensor, replace if required.
▶ Check connecting lead for breaks or short circuits, replace if required.
▶ Check and replace the appliance electronics.
1068 R Outside temperature sensor faulty. ▶ Remedy contact problem.
▶ Replace the sensor.
1073 R Flow temperature sensor short circuit. ▶ Check flow temperature sensor, replace if necessary.
▶ Check connecting lead for short circuits, replace if required.
▶ Check and replace the appliance electronics.
1074 R No signal from the flow temperature sensor. ▶ Check plug, connect correctly.
▶ Check flow temperature sensor, replace if necessary.
▶ Check connecting lead for breaks, replace if required.
▶ Check and replace the appliance electronics.
1075 R Short circuit in heat exchanger temperature
limiter.
▶ Check heat exchanger temperature limiter, replace if required.
▶ Check connecting lead for short circuits, replace if required.
▶ Check and replace the appliance electronics.
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