Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
The burner door assembly should already be removed from previous test

Observation:

Inspect the burner for restrictions / blockages and good overall condition.
Confirm that the spark gap to the burner surface is 5mm +/- 1mm.
Note.
1. Do NOT reassemble the appliance if the visual inspections are satisfactory.
2. Always examine any seals or gaskets, replacing where necessary.