Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
Boiler ON/OFF switch OFF
DHW temperature set to MAX
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Boiler ON/OFF switch ON.
Allow boiler to ignite and run.
With a flow rate at the tap of 9 l/min is there a temperature rise of 40°C?