Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove rectification electrode
Measurement:
Visually inspect the condition of the electrode for any signs of damage, cracked ceramic or warping.
Also measure the resistance across the electrode (it may be necessary to clean the electrode first).
Expect continuity / zero resistance.
Is the electrode in good condition and the resistance measured as expected?
Also measure the resistance across the electrode (it may be necessary to clean the electrode first).
Expect continuity / zero resistance.
Is the electrode in good condition and the resistance measured as expected?
Isolate as per TOPs P4
and refit as necessary