Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect lead from the detection electrode
Remove detection electrode from burner

Measurement:

Measure the resistance of the detection electrode from end to end.
Expect continuity / zero resistance.
Also thoroughly inspect the detection electrode for:
  • Cracks and damage to the electrode ceramic.
  • Distortion.
  • Good general condition.