Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect X1 from the PCB
Disconnect spark / rectification lead from the ignition module
Disconnect spark / rectification lead from the ignition module
Measurement:
Measure the resistance from the ignition module to pin 1 at X1.
Resistance should be approximately 1kΩ.
Resistance should be approximately 1kΩ.
Isolate as per TOPs P4
and refit as necessary