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 How do I clean my burner tubes? My propane gas grill isn't getting very hot. How do I fix this? My igniter is not working. How do I fix it? My cooking grates are starting to rust. Do they need to be replaced? How do I manually light my grill?