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Won't start is the most common symptom for Maytag MMV6178AAS. 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 "Won't start" problem for Maytag MMV6178AAS. So, if your MMV6178AAS microwave not heating, not working, won't run at all, won't start up or won't turn on, the following info will help you identify the problem.
Parts for Maytag MMV6178AAS
Microwave won't start or runs only when door is pulled? Replace faulty door interlock switches. This 2-pack covers top and bottom switches. DIY repair.
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Microwave won't turn on or has no power? A blown fuse is often the cause. This safety fuse protects circuits from shorts. Requires cover removal to replace.