Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove air intake
Disconnect connector from spark generator

Measurement:

Test 1:
Measure resistance between the two spades at the spark generator.
Test 2:
Measure resistance between each spade and a suitable earth point.
Expect greater than 1M Ohm on every test.