RESISTANCE SENSOR FLUE OVERHEAT STAT

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Remove the flue sensor from the top of the heat exchanger
(twist bayonet fitting)

Measure the resistance across the exposed sensor terminals.

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.