Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector X3 from the PCB
Measurement:
Measure the resistance between the black wire (pin 9) at X3 to the nearest black wire the mains terminal block (refer to picture).
Expect continuity / zero resistance.
Is the resistance measured as expected?
Note:
On some appliances the incoming terminal strip is located differently and has been rotated through 180° from the one shown.
Expect continuity / zero resistance.
Is the resistance measured as expected?
Note:
On some appliances the incoming terminal strip is located differently and has been rotated through 180° from the one shown.
Isolate as per TOPs P4
and refit as necessary