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Fault finding and diagnosis
Description
229 B
Flame failed during burner operation
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
240
V
Interruption of the NTC cabling
241
V
245 V
State out of range
88
Remedy
Tip: Check the ceramic insulator is not damaged, this can cause the spark to earth, twist
and pull the ceramic insulator to ensure it is not broken.
▶ Check the gas supply to the property and check the working pressure on the gas valve
inlet.
▶ Check the gas-air ratio and the dynamic gas pressure.
▶ Check the ionisation electrode and the harness for damage or contamination
( Chapter 9.10, page 59).
▶ Connection plug for external switch contact is not plugged into control unit.
▶ 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 (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 resistance is incorrect.
▶ If all tests are correct: replace the control unit.
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 (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 control unit.
▶ Check the wiring of the return temperature sensor.
▶ 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.
Greenstar 1000 – 6721835943 (2023/08)
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