RESISTANCE SENSOR NO FLOW / PRIMARY

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Remove the electrical connector from the no flow / primary sensor attached to the main heat exchanger

Measure the resistance across the exposed terminals of the sensor.

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.