Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector CN12 from the main PCB
Remove the connector from the flow turbine assembly

Measurement:

Measure the resistance between each of the pins listed below on connector CN12 and the corresponding wire on the flow turbine connector.
Connector CN12Flow Turbine Connector
Pin 1 (white)White
Pin 2 (Red) Red
Pin 3 (Blue)Blue

Expect continuity on each test.
Also inspect the condition of the harness visually for general condition and any signs of damaged insulation.