Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect connector from flow switch
Measurement:
Check for continuity (zero resistance) between the blue and black wires on M6 to the wire of corresponding colour at the flow switch.
Check for continuity (zero resistance) between the red wire on A9 to the red wire at the flow switch.
Inspect the harness and connectors for good overall condition.
Check for continuity (zero resistance) between the red wire on A9 to the red wire at the flow switch.
Inspect the harness and connectors for good overall condition.
Isolate as per TOPs P4
and refit as necessary