RESISTANCE DRY FIRE THERMISTOR AND HARNESS

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Ensure the boiler is cool
Remove thermistor connector from PCB

Measure resistance across the yellow leads from the dry fire thermistor.

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.