Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
Remove the combustion front assembly

Observation:

Inspect burner for damage and good general condition.
Note:
1. Before the combustion chamber door is refitted and the appliance left in operation the burner door gasket MUST be replaced.
2. The burner does not need to be removed from the combustion front assembly for this test.