DHW THERMISTOR SENSOR & HARNESS (DEMAND)

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Remove lower facia panel
Disconnect the connector ST16 situated at the bottom R/H side of the PCB

Measure resistance across the disconnected connector.

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.