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 for resistance across pins 1 (brown) and 2 (blue) of CN5.
Expected resistance approximately 164 ohms or greater.
Test 2:
Measure for resistance across pin 1 (brown) and a suitable earth connection.
Expected resistance greater than 1Mohm.
(O.L is acceptable because it is greater than 1MOhm)
Are the resistances measured as expected?