Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove the wires from the front side of terminals 2 and 3 on the main terminal strip as indicated by the red arrows

Measurement:

Measure the resistance between terminals 2 and 3 on the main terminal strip.
Expect continuity/ zero resistance.
Is the resistance measured as expected?