Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
CH Demand
Remove combustion chamber door
ON/OFF switch in ON position
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow the ignition sequence to commence.
Can a strong, consistent spark be seen to be taking place at the spark electrodes?
CORRECT SPARK OPERATION
INCORRECT OR NO SPARK OPERATION