Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove both wires from the overheat thermostat
Measurement:
Measure the resistance of the thermostat.
Is short circuit measured across the thermostat?
Is short circuit measured across the thermostat?
Isolate as per TOPs P4
and refit as necessary