Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect X10 from the PCB
Disconnect spades from the diverter valve
Disconnect spades from the diverter valve
Measurement:
Check for continuity (zero resistance) between the ends of the three wires running from the diverter valve to connector X10.
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