Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector A5 from the PCB
Remove the connector from the DHW thermistor
Remove the connector from the DHW thermistor
Measurement:
Measure the resistance of each of the wires from pins 7 and 9 on connector A5 to the corresponding wire at the DHW thermistor connector.
Expect continuity / zero resistance on each test.
Also visually inspect the harness for good general condition.
Are the resistances measured as expected and
is the harness in good general condition?
Expect continuity / zero resistance on each test.
Also visually inspect the harness for good general condition.
Are the resistances measured as expected and
is the harness in good general condition?
Isolate as per TOPs P4
and refit as necessary