Set Appliance State:

Set Multimeter to Resistance Set meter to measure resistance
Isolate Mains Power to appliance as per TOPs P4
Remove the J16 connector from the PCB
Remove the spark electrode lead from the spark generator
DO NOT remove the spark generator from its mounting

Measurement:

Test 1:
Measure the resistance across the white and orange wires of the spark generator connector.
Expect continuity / zero resistance.
Test 2:
Measure the resistance between the spark output terminal to earth.
Expect a resistance of approximately 526 ohms.
Are the resistances measured as expected?