Worcester Greenstar 8000 Life Installation And Maintenance Instructions Manual page 76

Fault finding and diagnosis
Description
232 B Boiler locked by external switching contact External cut off switch not used in UK: Ensure nothing is plugged into red I3
233 V Boiler identification module or device
electronics faulty
234 V Gas valve electrical fault
235 V Conflicting versions of boiler electr. and
boiler identification
237 V System fault
238 V Boiler electronics faulty
242 Boiler electr. system fault
244 System fault boiler electronics / basic
245 controller
249
250
251
252
253
254
258
257 V System fault boiler electronics / basic
259 controller
262 V System fault boiler electronics / basic
263 controller
265 B Heat demand lower than energy supplied
268 O Relay test was activated
76
Remedy
connection.
1. Connection plug for external switch contact is not plugged into PCB.
2. There is no feedback voltage at the external safety contact at the condensate lifting
pump blocks the heat generator.
3. Switching point for the external temperature monitor is set too low.
4. Connection cable to the external temperature monitor is damaged.
5. External temperature monitor is defective.
1. Wrong code plug is inserted.
2. Check the code plug is not damaged.
3. Replace the code plug if required.
1. Check the gas supply to the property and the inlet on the gas valve (check drop on
inlet).
2. Check the connections on the gas valve and the board (loose connection).
3. Check the continuity down harness and replace if required.
4. Check the voltage to the gas valve (19‒24 V DC approx. when demand).
5. Check for water on the gas valve connections.
6. Check the resistance on the gas valve (pins 1‒2 approx. 69, 5 Ohms).
7. Replace the gas valve if resistances are incorrect.
8. If all tests are correct: replace the PCB.
Replace the code plug or the burner control.
1. Check the code plug is not damaged.
2. Replace the code plug if required.
3. Replace the control unit (PCB).
1. Check the gas supply to the property and the inlet on the gas valve (check drop on
inlet).
2. Check the connections on the gas valve and the board (loose connection).
3. Check the continuity down harness and replace if required.
4. Check the voltage to the gas valve (19‒24 V DC approx. when demand).
5. Check for water on the gas valve connections.
6. Check the resistance on the gas valve (pins 1‒2 approx. 69, 5 Ohms).
7. If all tests are correct: replace the PCB.
1. Restart the appliance to see if the problem re-occurs.
2. If the fault remains after resetting: the burner controller (PCB) is defective.
1. Restart the appliance to see if the problem re-occurs.
2. Check the electrical connections on the board (check for loose wires etc.).
3. Check the code plug is not damaged.
4. Replace the code plug if required.
5. Replace the control unit (PCB).
1. Restart the appliance to see if the problem re-occurs.
2. Check the electrical connections on the board (check for loose wires etc.).
3. Check the code plug is not damaged.
4. Replace the code plug if required.
5. Replace the control unit (PCB).
1. Restart the appliance to see if the problem re-occurs.
2. Check the electrical connections on board (check for loose wires etc.).
3. Check the code plug is not damaged.
4. Replace the code plug if required.
5. Replace the control unit (PCB).
Not applicable, operating message, is not a fault.
Not applicable, status message.
Greenstar 8000 Life – 6720883865 (2021/11)