Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove the 6 pin plug from the PCB

Measurement:

Test 1:
Measure the resistance between pin 2 (red) and pin 4 (black).
Expect a resistance of approximately 4.1kOhms.
Test 2:
Measure the resistance between pin 2 (red) and a suitable earth point.
Expect 1MOhm or greater.
(O.L is acceptable because this is greater than 1MOhm)
Are the resistances measured as expected?