Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect connector X7 from the PCB
Disconnect plug from flow switch
Disconnect plug from flow switch
Measurement:
Check for continuity (zero resistance) between the wires running from the flow switch to pin 7 (pink) and 8 (black) at connector X7.
Inspect the harness and plugs for good overall condition.
Inspect the harness and plugs for good overall condition.
Isolate as per TOPs P4
and refit as necessary