Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove X2 from the PCB and the connector at the diverter valve
Note.
Disengage Diverter head to facilitate connector removal

Measurement:

Measure for resistance across each pin 1 - 4 (X2) in turn to Earth
(Main terminal block) and inspect harness for any damage.
Expected resistance Open Circuit.