Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector M6 from the PCB
Measurement:
Measure the resistance between pins 1 and 2 on connector M6.
RESISTANCE THERMISTOR DHW AND HARNESS
| Temperature Range (°C) | Resistance Range |
|---|---|
| 0°C to 10°C | 27.0kΩ - 18.0kΩ |
| 10°C to 20°C | 18.0kΩ - 12.0kΩ |
| 20°C to 30°C | 12.0kΩ - 8.4kΩ |
| 30°C to 40°C | 8.4kΩ - 6.0kΩ |
| 40°C to 50°C | 6.0kΩ - 4.4kΩ |
| 50°C to 60°C | 4.4kΩ - 3.2kΩ |
| 60°C to 70°C | 3.2kΩ - 2.4kΩ |
| 70°C to 80°C | 2.4kΩ - 1.9kΩ |
| 80°C to 90°C | 1.9kΩ - 1.5kΩ |
| 90°C to 100°C | 1.5kΩ - 1.2kΩ |
Resistances vary with temperature and should conform approximately to the table below:
Note: Clicking on the resistance table will switch between table and graph view.
1
6
Isolate as per TOPs P4
and refit as necessary