XSol Diagnostic System

RESISTANCE DHW SENSOR AND HARNESS

Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Remove connector X3 from the PCB

Measurement:

Measure the resistance between pin 9 (blue) and
pin 21 (blue) on connector X3.

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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

1

12

13

24

X3