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.
Is correct sparking observed at the spark electrode?
Note:
Lockout will occur approximately 10 seconds after sparking begins.
If lockout does occur then lockout reset will have to be depressed.