Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect connector X3 from the PCB

Measurement:

Test 1:
Measure the resistance between pin 5 (blue) and pin 6 (black)
Resistance should be EITHER approximately 6.5kOhms
OR greater than 1M Ohm depending on diverter valve position.
Test 2:
Measure the resistance between pin 5 (blue) and pin 7 (brown)
Resistance should be EITHER approximately 6.5kOhms
OR greater than 1M Ohm depending on diverter valve position.