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 (rotate selector switch to
'O' position, then rotate back to DHW/CH position).
Allow self-check to complete and appliance to commence its ignition sequence.
Does the burner cross light with a stable flame picture?
Note.
Burner will only light for approximately 10 seconds then lockout will occur
after 1 to 3 attempts, reset appliance as required until test is complete.