Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Boiler in CH and DHW mode, NO demands
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

On initial start up the display should illuminate, if a fault code is displayed choose that option below.
If the appliance is not in a fault code the fan should run for approximately 8 seconds then stop.
The boiler should then enter standby, standby is indicated by the display showing the flow temperature, neither the tap or radiator symbols flashing, and the pump should not be running.
Does the appliance behave as described above?
Note:
If the appliance is showing a fault code the fan may still run.