Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Gain access to the PCB
Disconnect connector X14 from the PCB
Disconnect connector X14 from the PCB
Measurement:
Test 1:
Measure the resistance across pins 5 (green) and 6 (black) of the disconnected connector.
Resistance should be approximately 780 Ohms.
Test 2:
Measure the resistance across pin 5 (green) and a suitable earth point.
Resistance should be greater than 1M Ohm.
Measure the resistance across pins 5 (green) and 6 (black) of the disconnected connector.
Resistance should be approximately 780 Ohms.
Test 2:
Measure the resistance across pin 5 (green) and a suitable earth point.
Resistance should be greater than 1M Ohm.
Isolate as per TOPs P4
and refit as necessary