Set Appliance State:

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

Measurement:

Test 1.
Measure the resistance between pin 5 (brown) and
pin 11 (blue) on connector X2.
Expected resistance as per table below:
Test 2.
Measure the resistance between either pin 5 (brown) or pin 11 (blue) on connector X2 to a suitable earth point.
Expected resistance greater than 1 Mohm.