Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove electrical connector to DHW temperature sensor
& connector CN9 from the PCB
& connector CN9 from the PCB
Measurement:
Measure the resistance (continuity) across DHW temperature sensor harness.
Expected resistance is continuity (zero resistance) across each wire of the harness.
Note.
Ensure a good connection is made during resistance tests or misdiagnosis will occur.
Expected resistance is continuity (zero resistance) across each wire of the harness.
Note.
Ensure a good connection is made during resistance tests or misdiagnosis will occur.
Isolate as per TOPs P4
and refit as necessary