Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Remove the Yellow spaded wires from the Thermostat Sensor.
Measurement:
Measure the resistance across the terminals of the sensor.
The resistance varies with temperature and should conform approximately with the table below:
The resistance varies with temperature and should conform approximately with the table below:

Isolate as per TOPs P4
and refit as necessary