RESISTANCE THERMISTOR RETURN AND HARNESS

Set Multimeter to Resistance

Isolate Mains Power to appliance as per TOPs P4
Remove the connector J1 from the PCB

Ensure Thermistors are secured tightly to the pipework.
Measure the resistance across the blue and white (5 & 6) wires of the connector.

Resistances vary with temperature and should conform approximately to the table below:

Note: Clicking on the resistance table will switch between table and graph view.