Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
Remove burner assembly and burner manifold

Observation:

Thoroughly inspect the burner manifold checking the injectors
for restrictions, damage and general good condition.
Note:
1. The injector sealing washers must be replaced
if the injectors have been removed.
2. Upon reassembly all disturbed joints should
be checked for gas tightness.