Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect connector X2 from the PCB
Measurement:
Measure the resistance between pin 9 and pin 13 on connector X2.
RESISTANCE DHW THERMISTOR AND HARNESS
1
8
8
9
16
16
Resistances vary with temperature and should conform approximately to the table below:
| Temperature Range (°C) | Resistance Range |
|---|---|
| 0°C to 10°C | 20.0kΩ - 34.0kΩ |
| 10°C to 20°C | 13.0kΩ - 20.0kΩ |
| 20°C to 30°C | 8.0kΩ - 13.0kΩ |
| 30°C to 40°C | 5.3kΩ - 8.0kΩ |
| 40°C to 50°C | 3.5kΩ - 5.3kΩ |
| 50°C to 60°C | 2.4kΩ - 3.5kΩ |
| 60°C to 70°C | 1.7kΩ - 2.4kΩ |
| 70°C to 80°C | 1.2kΩ - 1.7kΩ |
| 80°C to 90°C | 900Ω - 1.2kΩ |
| 90°C to 100°C | 700Ω - 900Ω |
Note: Clicking on the resistance table will switch between table and graph view.
Colour of wires may change but test points remain the same
Isolate as per TOPs P4
and refit as necessary