Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Remove actuator from the 3-way valve assembly & place in a safe position to observe its operation
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Cancel purge cycle & If required, reset boiler.
Allow the boiler to operate for DHW.
Confirm actuator spindle is in the recessed position (DHW).
Note.
Be aware that the spindle may need to be pushed into the recessed position (Isolate Mains Power to appliance as per TOPs P4) as it relies on the cartridge for this.