Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Mains reset switch OFF
Set DHW temperature selector to MAX
CH switch OFF
Ensure the boiler is cool so that there is demand for preheat
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Mains reset switch On.
Allow fan to run.
Observe burner.
After approximately 10 seconds does sparking occur and burner ignite?
Note:
Boiler should attempt to ignite at least 3 times before going to lockout. This should take approximately 1 minute.