Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
CH Demand
Disconnect the ignition lead from terminal 3 on the spark generator and position as shown in the image opposite with the aid of a crocodile clip
(ignition lead positioned just off the terminal inside the spark generator)
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance if required.
Allow fan to run and ignition sequence to commence.
As the appliance goes through repeated ignition attempts can a strong consistent spark be observed between the ignition lead and the spark generator terminal?
Note.
The appliance will enter lockout after 3 failed attempts of ignition, approximately 40 seconds between each attempt, reset as required until test is complete.