RESISTANCE HARNESS DHW TEMPERATURE PROBE

Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Remove connector CN4 from the PCB
Disconnect the connector from the DHW temperature probe

Measurement:

Measure the resistance between pins 5 and 6 (grey wires) on
connector CN4 to the corresponding pins of the DHW temperature probe harness as indicated below.
Expect continuity / zero resistance on both tests.
Also visually inspect the condition of the harness.

ar clas he 24.dhw thermistor location.gif

Note.
On some PCB's the connector will be labelled as CN12 not CN4 and its orientation will differ, however the test points and expected results remain the same.