Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connectors X15 and X13 from the PCB
Measurement:
Test 1:
Measure the resistance between the black and white wires at connector X13.
Expect approximately 8.7 kOhms or O.L.
Test 2:
Measure the resistance between the black wire of connector X13 and the wire at connector X15.
Expect approximately 8.7 kOhms or O.L.
Are the resistances as expected?
Measure the resistance between the black and white wires at connector X13.
Expect approximately 8.7 kOhms or O.L.
Test 2:
Measure the resistance between the black wire of connector X13 and the wire at connector X15.
Expect approximately 8.7 kOhms or O.L.
Are the resistances as expected?
Isolate as per TOPs P4
and refit as necessary