Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
CH Demand
Remove both leads from the outlet side of the spark generator.
Place the earth lead of the spark generator output close to the
spark lead terminal of the generator
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Important keep clear of the lead and generator during this test!
During the ignition sequence observe the earth lead/ generator terminal.
Is sparking seen?
Once this test is completed ISOLATE MAINS POWER and reconnect the spark and earth leads to the generator.