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No heat is the most common symptom for Kenmore 721.80802401 (72180802401, 721 80802401). It takes 15-30 minutes to fix on average. The instructions below from DIYers like you make the repair simple and easy. Many parts also have a video showing step-by-step how to fix the "No heat" problem for Kenmore 721.80802401. So, if your 721.80802401 microwave not heating, runs but doesn't heat or turns on but doesn't heat food, the following info will help you identify the problem.
Parts for Kenmore 72180802401
Microwave won't start or runs with door open? Failed door switch prevents safe operation. Simple DIY fix with basic tools in under 30 minutes.
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Microwave won't heat but runs normally? A failed magnetron is the likely cause. This part generates the microwaves that cook food. Moderate DIY repair.