Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector X6 from the PCB
If required attach temperature clamp to the flow pipe
to determine temperature range
If required attach temperature clamp to the flow pipe
to determine temperature range
Measurement:
Measure for resistance across pins 5 (Black) and 6 (pink) of connector X6.
Isolate as per TOPs P4
and refit as necessary