Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector A8 from the PCB
Disconnect plug from diverter valve

Measurement:

Check for continuity (zero resistance) between
the three wires running between the PCB
and the diverter valve.
Inspect the harness and connectors
for good overall condition.