Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
Summer/Winter button set to summer
CH Temperature selector to minimum
DHW Temperature selector to maximum
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

With appliance operating with a DHW demand, turn the tap off.
Does the appliance end its demand for hot water and the burner extinguish?
Note.
There is no preheat on this appliance so the demand should stop straight away.