Cindy A Onawa , IA March 09, 2016 It wouldn't heat We purchased the magnetron and replaced it. It was actually pretty simple just take off the back and unplug the old one and put new one back in and put the back onto the microwave and plug it in and it works great! 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes