Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector X10 from the PCB
Measurement:
Test 1:
Measure the resistance between the brown and blue wires at connector X10.
Expect a resistance of 1 MOhm or greater.
(O.L is acceptable because this is greater than 1 MOhm)
Test 2:
Measure the resistance between the brown wire at connector X10 and a suitable earth.
Expect a resistance of 1 MOhm or greater.
(O.L is acceptable because this is greater than 1 MOhm)
Are the resistances measured as expected?
Measure the resistance between the brown and blue wires at connector X10.
Expect a resistance of 1 MOhm or greater.
(O.L is acceptable because this is greater than 1 MOhm)
Test 2:
Measure the resistance between the brown wire at connector X10 and a suitable earth.
Expect a resistance of 1 MOhm or greater.
(O.L is acceptable because this is greater than 1 MOhm)
Are the resistances measured as expected?
Isolate as per TOPs P4
and refit as necessary