CH THERMISTOR SENSOR

Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Remove the red leads from CH thermistor

Measurement:

Measure resistance across the
exposed terminals of the sensor.

Temperature Range (°C)	Resistance Range
0°C to 10°C	20.0kΩ - 33.0kΩ
10°C to 20°C	12.0kΩ - 20.0kΩ
20°C to 30°C	8.0kΩ - 12.0kΩ
30°C to 40°C	5.3kΩ - 8.0kΩ
40°C to 50°C	3.6kΩ - 5.3kΩ
50°C to 60°C	2.5kΩ - 3.6kΩ
60°C to 70°C	1.8kΩ - 2.5kΩ
70°C to 80°C	1.3kΩ - 1.8kΩ
80°C to 90°C	1.0kΩ - 1.3kΩ
90°C to 100°C	700Ω - 1.0kΩ

Note:
Resistance measured will vary according to the boiler temperature the cooler the boiler the higher the resistance. The resistance should conform approximately to the table.
Left clicking on the table will switch between graph and table view.