Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove X2 connector from the PCB

Measurement:

Carry out resistance tests as detailed below and also inspect harness for any damage.
Test 1. Measure for resistance across pins 1 (Blue)
and 2 (Brown) of connector X2.
Expected resistance 12 kOhms.
Test 2. Measure for resistance across pins 3 (Black)
and 4 (Blue) of connector X2.
Expected resistance 12 kOhms.
Test 3. Measure for resistance across pin 1 (Blue)
and Earth (Main terminal block).
Expected resistance Open Circuit.
Test 4. Measure for resistance across pin 4 (Blue)
and Earth (Main terminal block).
Expected resistance Open Circuit.