Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Remove the retaining clip which
holds the diverter motor in place

Observation:

Check the diverter spindle for free movement, using a flat bladed screwdriver it should be possible to press the spindle in with about 20mm travel.
There should be resistance from the spring forcing the spindle back out to its rest position.