Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect the ignition lead to the electrode

Measurement:

Inspect the ignition electrode for condition and correct gap.
Gap should be 3.6 mm +/- 1.1 mm.
Carry out a resistance check from the tip of the electrode
to the spade connector where the ignition lead connects to.