Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove electrical connector to diverter valve
Remove diverter valve head from body (if required)

Measurement:

Test 1:
Measure the resistance between pin 1 and pin 2.
Test 2:
Measure the resistance between pin 3 and pin 2.
Resistances should be either approx. 6.0 kOhms or
greater than 1M Ohm depending on the motor position.