Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
CH Demand
On/Off Switch ON
Disconnect ignition lead and rest near spark generator terminal as shown in the picture
(rest against side panel or use crocodile clip / tap to secure)
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance as necessary and allow ignition sequence to commence.
Is there a strong consistent spark between the spark generators terminal and the crocodile clip?
Notes:
1. The appliance may lockout during this test reset as necessary to complete the test.
2. Test shown viewed from the side but can be angled to be seen from the front if access is poor.