Set Appliance State:
Isolate Mains Power to appliance as per TOPs P4
Remove connector CN4 from PCB.
Remove connector CN4 from PCB.
Measurement:
Measure the resistance between pin 3 (Black) and pin 6 (grey) on connector CN4.
Expect a resistance of 3.4 ohms approximately.
Expect a resistance of 3.4 ohms approximately.

Isolate as per TOPs P4
and refit as necessary