Set Appliance State:

Turn Hot Water Tap On
ECO mode ON (ECO on display)
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Run the DHW tap with a flow rate of 3 l/min.
Does the boiler recognise the DHW demand?
Note:
Demand is indicated by lines flashing below the hot water tap symbol in the display and the °C appearing next to the temperature.