Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector from the flow thermistor
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 the resistance across the exposed pins of the flow thermistor.
Isolate as per TOPs P4
and refit as necessary