Set Appliance State:

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

Observation:

Inspect heat exchanger to ensure it is clear and free of obstruction.
Note:
1. Before reassembly check the integrity of all disturbed
gaskets and seals and replace as necessary.
2. Upon reassembly all disturbed joints should be
checked for gas tightness.