Cleaning and Troubleshooting Your Burner

Clogged holes can cause a grill to have hot and cold spots, which not only make it difficult to cook evenly, but also increases the chance of a shattering your glass window.

Check out the burner's gas outlet ports around it's perimeter for splits or separations of the top and bottom halves. A burner damaged this bad needs replacement, if no obvious external damage is present you can continue to clean the grill

Brush the outer parts of the burner with a wire brush, especially the ports

Using a flexible wire, an open paper clip, or a drill bit, probe each port to clear it of grime and rust
Now, lightly tap the burner, this will help cause any of the residue to fall out of the ports and tubes
Too many excessively obstructed ports that you cannot clear is a sign to replace the burner. If you can clear the ports and the previous inspection and cleaning processes did not indicate burner failure, you can continue:

Check the gas jets at the end of the valves for spider webs, dirt, or dust. Clean them if necessary
Assuming that the valves are turning and you have gas, the burner should be reinstalled into your grill and tested to see if the cleaning process helped.

While you have the bottom of the aluminum casting exposed, take the opportunity to clean it the best you can by removing any gunk out with a putty knife, garden tool, etc.

Replacement is necessary if these cleaning procedures did not work.