Set Appliance State:

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

Observation:

Boiler ON/OFF switch ON.
Allow boiler to commence its ignition sequence and burner to ignite.
Does burner remain alight and sparking cease?
Note:
If flame does not establish and sparking ceases then lockout
will occur after approximately 10 seconds. If lockout occurs then
lockout reset will have to be depressed.