Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector CN11 from the PCB

Measurement:

Test 1.
Measure the resistance between the brown
and blue pins on connector CN11.
Test 2:
Measure the resistance between the black
and blue pins on connector CN11.
Expected resistance for both tests 6.0 KOhms or greater.
Test 3.
Measure the resistance between the brown and
black pins separately to a suitable earth.
Expected resistance greater than 1 MOhm on each test.
Note.
A reading of O.L is acceptable as this is greater than 1 MOhm.