Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove ignition electrode lead from
terminal 3 of the spark generator
terminal 3 of the spark generator
Measurement:
Measure the resistance between pin 3 on the spark generator and the blue wire on connector X21.
Expect a resistance of approximately 645 ohms.
Is the resistance measured as expected?
Expect a resistance of approximately 645 ohms.
Is the resistance measured as expected?
Isolate as per TOPs P4
and refit as necessary