Set Appliance State:

Turn Hot Water Tap On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the boiler to ignite and run on DHW operation.
Confirm that the diverter valve has moved to its DHW position?
Note.
DHW position will be when the stepper motor has moved
to its fully retracted position.