Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove the leads from the CH sensor
Measurement:
Measure resistance across the exposed sensor terminals.
CH SENSOR RESISTANCE
Resistances vary with temperature and should conform approximately to the table below:
| Temperature Range (°C) | Resistance Range |
|---|---|
| 0°C to 10°C | 19.0kΩ - 30.0kΩ |
| 10°C to 20°C | 12.0kΩ - 19.0kΩ |
| 20°C to 30°C | 8.2kΩ - 12.0kΩ |
| 30°C to 40°C | 5.6kΩ - 8.2kΩ |
| 40°C to 50°C | 3.9kΩ - 5.6kΩ |
| 50°C to 60°C | 2.8kΩ - 3.9kΩ |
| 60°C to 70°C | 2.0kΩ - 2.8kΩ |
| 70°C to 80°C | 1.5kΩ - 2.0kΩ |
| 80°C to 90°C | 1.2kΩ - 1.5kΩ |
| 90°C to 100°C | 900Ω - 1.2kΩ |
Note: Clicking on the resistance table will switch between table and graph view.
Appearance of sensor may differ but resistances are the same
Isolate as per TOPs P4
and refit as necessary