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 LV1 from the PCB

Measurement:

Measure the resistance between the pin 11 (red) to pin 13 (red) at connector LV1.
Resistance should be short circuit (zero resistance).
Is the resistance measured as expected?
Note:
Connector may differ slightly in appearance but this does not affect the test.