Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector CN1 from the main PCB
Measurement:
Measure the resistance between the pins on CN1 and the terminals on the incoming mains terminal block as listed in the table below:
Expect continuity on each test.
Also visually inspect the harness for general condition and any signs of damaged insulation.
| Connector CN1 | Incoming mains terminal strip | Pin 4 (Brown) | Live (marked L) |
| Pin 3 (Blue) | Neutral (marked N) |
| Pin 1 (Yellow/Green) | Earth |
Expect continuity on each test.
Also visually inspect the harness for general condition and any signs of damaged insulation.
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Isolate as per TOPs P4
and refit as necessary