Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Gain access to PCB

Observation:

Ensure that the ignition PCB is fitted on to the main PCB.
Check that it is fitted correctly (all pins correctly aligned), securely and making a good contact.
Notes:
1. The Ignition PCB should be fitted directly on to the main PCB on the left.
It should slide on to the main PCB and be a nice tight fit.
2. Try removing the ignition PCB and re-fitting it.