Set Appliance State:
Set Multimeter to Resistance 
Isolate Mains Power to appliance as per TOPs P4
Remove the 4 wire connector from X6 on the PCB
Gain access to PCB (use insulation mat as required)
Remove the 4 wire connector from X6 on the PCB
Gain access to PCB (use insulation mat as required)
Measurement:
Test 1:
Measure the resistance between pins 1 and 2 on the 4 wire connector removed from X6 on the PCB.
Expect a resistance of approximately 1.6 KOhms.
Test 2:
Measure the resistance between pins 3 and 4 on the 4 wire connector removed from X6 on the PCB.
Expect a resistance of approximately 2.8 KOhms.
Are the resistances measured as expected?
Measure the resistance between pins 1 and 2 on the 4 wire connector removed from X6 on the PCB.
Expect a resistance of approximately 1.6 KOhms.
Test 2:
Measure the resistance between pins 3 and 4 on the 4 wire connector removed from X6 on the PCB.
Expect a resistance of approximately 2.8 KOhms.
Are the resistances measured as expected?
Isolate as per TOPs P4
and refit as necessary