Isolate Mains Power to appliance as per TOPs P4
Remove diverter valve actuator head to expose the diverter valve spindle
Remove diverter valve actuator head to expose the diverter valve spindle
Observation:
Depress and release the valve spindle.
Does the spindle move freely?
Refit diverter valve actuator head
Does the spindle move freely?
Refit diverter valve actuator head
Isolate as per TOPs P4
and refit as necessary