Set Appliance State:

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

Observation:

Reset appliance if required (press reset button for 2 seconds and release).
Allow appliance to commence its ignition sequence.
Does the burner cross light with a stable flame picture?
Note.
Burner will only light for approximately 5 seconds then lockout
will occur, reset appliance as required until test is complete.