Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect plug X22 from the PCB

Measurement:

Test 1:
Measure the resistance between pin 3 (blue) and pin 5 (red).
Resistance should be approximately 13.8 kOhms.
Test 2:
Measure the resistance between pin 4 (white) and pin 5 (red).
Resistance should be approximately 10.3 kOhms.