Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Remove the burner door assembly complete with burner

Observation:

1. Inspect the burner for restrictions and any signs of damage.
2. Measure the gap between the ionisation electrode and burner.
The gap should measure approximately 18.7mm +/- 1mm.
Note.
Refer to adapt regarding any gasket replacement requirements.