Set Appliance State:

Mains Power Off
Selector switch to Hot Water position
DHW temperature control set to MAX
Preheat OFF
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Ensure the start up sequence has completed, the pump and fan have stopped and the boiler is showing 0.
Run the hot tap with a flow rate of 3 l/min.
The display should show "d" and the fan and pump should run.
Does the boiler react as described above?
Note:
If a fault code is displayed after running the tap click HERE.