Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Gain access to PCB (use Insulation Mat as required)
Disconnect connector J2 from the ignition PCB

Measurement:

Measure the resistance between pin 1 (brown)
and pin 3 (black) on J2 connector.
Expect continuity (zero resistance).