Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect connector X8 from the PCB
Measurement:
Test 1:
Measure the resistance between the white and green wires at the disconnected plug.
Resistance should be approximately 24.6kOhms.
Test 2:
Measure between each of the four wires at the disconnected plug to a suitable earth point.
Resistance should be greater than 1M Ohm on each test.
Measure the resistance between the white and green wires at the disconnected plug.
Resistance should be approximately 24.6kOhms.
Test 2:
Measure between each of the four wires at the disconnected plug to a suitable earth point.
Resistance should be greater than 1M Ohm on each test.
Isolate as per TOPs P4
and refit as necessary