Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Gain access to PCB (use Insulation Mat as required)
Disconnect connector LV1 from the PCB

Measurement:

Measure the resistance between the white wires on LV1 (pins 4 and 5).
Resistance should be short circuit (zero resistance).