Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector CN5 from the PCB

Measurement:

Test 1:
Measure the resistance between pins 3 (blue) and 4 (brown) on connector CN5.
Expect approximately 6.1 - 8kOhms or greater.
Test 2:
Measure the resistance between pins 3 (blue) and 5 (black) on connector CN5.
Expect approximately 6.1 - 8kOhms or greater.
Are the resistances measured as expected?