Set Appliance State:

Mains Power Off
Turn hot water tap ON with a flow rate of 4 l/min
DHW & CH thermostats turned up to the 3 o'clock position
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Does the boiler recognise a DHW demand?
Note:
DHW demand is recognised by a tap and pump symbol appearing in the display (the tap symbol may flash).