Set Appliance State:

Mains Power Off
Function selector in CH position
All heating controls calling
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Wait at least 5 seconds after power On.
Isolate Mains Power to appliance as per TOP's P4
Remove diverter valve motor/actuator.
Is the actuator in the CH position spindle fully extended?
Note:
When in CH position brass spindle is within a couple
of mm below the level of the plastic case.