Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect the leads from the ON/OFF switch, noting their connections
ON/OFF switch ON

Measurement:

Test 1:
Measure resistance across the two back connectors (marked E and marked D).
Test 2:
Measure resistance across the two front connectors (also marked E and D).