XSol Diagnostic System

CH SENSOR (FAULT CODE)

Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Remove red wires from CH temperature sensor
Ensure boiler is cool

Measurement:

Measure resistance across spade terminals of the sensor.
Resistance should conform approximately to the table below.

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wc c1 375696 thr ch in situ wires disc.jpg

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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:
Click on resistance table to switch between table and graph view.