RESISTANCE FLOW THERMISTOR

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Disconnect plug from the flow thermistor

Measure the resistance between the two pins of the flow thermistor.
Resistance should conform approximately to the table below.

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

This is a dry pocket sensor, if boiler is in a difficult position it may be easier to remove from the appliance to test.