Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Remove the fan hood assembly

Observation:

Inspect the burner assembly for blockages or damage.
Note:
If burner condition is ok do not reassemble, as it will need to be removed for further tests.
Per manufacturer's instructions, upon reassembly a replacement gasket (J04-350) for the burner is required.