Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect plug marked CON12 from the PCB
Measurement:
Test 1:
Measure the resistance across the two red wires of the disconnected plug.
Resistance should be approximately 60Ω.
Test 2:
Measure the resistance between one of the red wires at the disconnected plug to a suitable earth point.
Resistance should be greater than 1MΩ (or O.L).
Measure the resistance across the two red wires of the disconnected plug.
Resistance should be approximately 60Ω.
Test 2:
Measure the resistance between one of the red wires at the disconnected plug to a suitable earth point.
Resistance should be greater than 1MΩ (or O.L).
Isolate as per TOPs P4
and refit as necessary