Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove the connector from the flow turbine
Measurement:
Measure the resistance of each of the wires on the flow turbine harness as per the table below:
Expect continuity / zero resistance on each test.
Also visually inspect the condition of the harness and its connectors.
| Flow turbine connector | Connector X3 | Black | Pin 13 |
| Red | Pin 2 |
| Blue | Pin 1 |
Expect continuity / zero resistance on each test.
Also visually inspect the condition of the harness and its connectors.
Isolate as per TOPs P4
and refit as necessary