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No heat is the 2nd most common symptom for Lg LMHM2017ST. 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 Lg LMHM2017ST. So, if your LMHM2017ST 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 LG LMHM2017ST
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.