DHW THERMISTOR SENSOR & HARNESS

Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Remove connector X6 from the PCB
Ensure DHW is cool (this can be achieved by running the
DHW with the gas to the appliance turned off)

Measurement:

Measure resistance across pins 3 & 4 of connector X6.

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.