Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
Selector switch to DHW position
CH temperature selector to Min
DHW temperature selector to Max
Gas On
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow fan to run and burner to ignite.
With a flow rate of 12 l/min at the tap is there a temperature rise of 35 degrees C and is operation satisfactory?