RETURN STAT RESISTANCE

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Remove the connector from the return thermostat

Measure the resistance between the thermostat on the heat exchanger
flow pipe and a suitable ground point on the appliance (i.e. the return pipe).

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.