Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Reset lockout if necessary.
Allow fan to run and burner to ignite.
With a flow rate at the tap of approximately 11 l/min, is there a temperature rise of approximately 35 deg C and is the DHW operation satisfactory?