Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove PCB from appliance
Remove electrode leads from spark generator on the PCB

Measurement:

Measure the resistance between the tip of the ignition electrode to the + lead at the PCB.
Resistance should be approximately 1kOhm.
Measure the resistance between the earth spade at the burner to the - lead at the PCB.
Resistance should be short circuit (zero resistance).
Inspect the leads and electrode for
any signs of damage or shorting.