Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Timer set to OFF position
Remove the 2 black wires (labelled "black") from their terminals
Remove the 2 black wires (labelled "black") from their terminals
Measurement:
Measure the resistance between the 2 black wires to the timer.
Expect open circuit.
Is the resistance measured as expected?
Expect open circuit.
Is the resistance measured as expected?
Isolate as per TOPs P4
and refit as necessary