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Description
232 B
Boiler locked by external switching contact External cut off switch not used in UK: Ensure nothing is plugged into red I3 connection.
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 V
Boiler electr. system fault
244 V
System fault boiler electronics / basic
controller
245 V
State out of range
246
–
System fault boiler electronics / basic
controller
Greenstar 2000 – 6 721 820 552 (2021/02)
Remedy
▶ Connection plug for external switch contact is not plugged into PCB.
▶ There is no feedback voltage at the external safety contact of a third party condensate
pump blocking the boiler.
▶ Switching point for the external temperature monitor is set too low.
▶ Connection cable to the external temperature monitor is damaged.
▶ External temperature monitor is defective.
If code plug is present:
▶ Check that correct plug is inserted.
▶ Check the code plug is not damaged.
▶ Replace the code plug if required.
If code plug is not present:
▶ Check appliance electronics (PCB), replace if necessary.
▶ Check the gas supply to the property and the inlet on the gas valve (check drop on inlet).
▶ Check the connections on the gas valve and the board (loose connection).
▶ Check the continuity down harness and replace if required.
▶ Check the voltage to the gas valve (19‒24 V DC approx. when demand).
▶ Check for water on the gas valve connections.
▶ Check the resistance on the gas valve (pins 1‒2 approx. 69.5 Ohms).
▶ Replace the gas valve if resistances are incorrect.
▶ If all tests are correct: replace the PCB.
If code plug is present:
▶ Check that correct plug is inserted.
▶ Check the code plug is not damaged.
▶ Check the code plug software version.
▶ Replace the code plug if required.
If code plug is not present:
▶ Check appliance electronics software version, replace if necessary.
If code plug is present:
▶ Check that correct plug is inserted.
▶ Check the code plug is not damaged.
▶ Replace the code plug if required.
If code plug is not present:
▶ Check appliance electronics (PCB), replace if necessary.
▶ Check the gas supply to the property and the inlet on the gas valve (check drop on inlet).
▶ Check the connections on the gas valve and the board (loose connection).
▶ Check the continuity down harness and replace if required.
▶ Check the voltage to the gas valve (19‒24 V DC approx. when demand).
▶ Check for water on the gas valve connections.
▶ Check the resistance on the gas valve (pins 1‒2 approx. 69.5 Ohms).
▶ If all tests are correct: replace the PCB.
▶ Reset control appliance / burner control unit - factory reset.
▶ Reconnect electrical connections at control unit / burner control unit correctly.
▶ Replace the control unit/burner control unit.
▶ Reset control appliance / burner control unit - factory reset.
▶ Reconnect electrical connections at control unit / burner control unit correctly.
▶ Replace the control unit/burner control unit.
▶ Restart the appliance to see if the problem re-occurs.
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Check the code plug, if present, is not damaged.
▶ Replace the code plug, if present and required.
▶ Replace the control unit (PCB).
▶ Reset burner control - factory reset.
▶ Check electrical connections of burner control.
▶ Replace burner control.
Fault finding and diagnosis
75
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