Set Appliance State:

Set Multimeter to Resistance Set meter to measure resistance
Isolate Mains Power to appliance as per TOPs P4
Remove wires from terminals 3 and 5 of the integral
timer and make safe
Timer set to OFF position
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the resistance between terminal 3 and 5.
Expect open circuit.
Is the resistance as expected?