Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect the inline plug from the flow sensor

Measurement:

Measure for continuity (zero resistance) on each wire of the flow turbine harness.
Red to Red (pin 8 on LV2)
Black to Black (pin 9 on LV2)
Yellow to Yellow (pin 10 on LV2)
Inspect harness and connectors for good overall condition.
Is the harness satisfactory?