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 propane gas grill isn't getting very hot. How do I fix this? How do I clean my burner tubes? My igniter is not working. How do I fix it? How do I perform additional leak checks on my Genesis II gas grill? How do I manually light my grill?