Set Appliance State:
Set Multimeter to Resistance 
Isolate Mains Power to appliance as per TOPs P4
Gain access to PCB (use insulation mat as necessary)
Disconnect connector M3 from the PCB
Gain access to PCB (use insulation mat as necessary)
Disconnect connector M3 from the PCB
Measurement:
Measure the resistance between the two brown
wires of connector M3.
The resistance measured will depend upon the temperature of the appliance and should conform to the table below.
wires of connector M3.
The resistance measured will depend upon the temperature of the appliance and should conform to the table below.
| Temperature °C | Resistance in kOhms |
| 20-30 | 12.0-7.5 |
| 30-40 | 7.5-5.1 |
| 40-50 | 5.1-3.9 |
| 50-60 | 3.9-2.9 |
| 60-70 | 2.9-2.0 |
| 70-80 | 2.0-1.6 |
Isolate as per TOPs P4
and refit as necessary