Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap ON
DHW Temperature Control to MAX
Remove spark leads from control box
With the aid of a crocodile clip hold the spark leads in place
close to the control box as shown
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance if necessary, press and hold reset button
for 5 seconds, then release.
Allow boiler to commence its ignition sequence.
.... CAUTION. Stand away from boiler.
Does sparking occur for approximately 4 seconds?
Note:
Lockout may occur after 5 attempts to ignite. If lockout occurs,
reset boiler as required to complete test.