Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Locate the Flow Thermistor and remove the two connectors
(one with Black wires and one with a Red)
(one with Black wires and one with a Red)
Measurement:
Test resistance between two pins of the thermistor.

Isolate as per TOPs P4
and refit as necessary