Why am I getting uneven heat on my grill? The biggest cause of uneven heat would be an uneven flame pattern on the burner tubes. To correct this, simply clean your burner tubes with the help of our blog here! Related articles My grill is not getting very hot. What should I do? Should I adjust the air shutters on my burner tubes? My igniter is not working. What should I do? What color should my flame be? How do I perform additional leak checks on my Genesis II gas grill?