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No heat is the 2nd most common symptom for Whirlpool YKCMS1555RSS0. 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 Whirlpool YKCMS1555RSS0. So, if your YKCMS1555RSS0 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 Whirlpool YKCMS1555RSS0
Microwave not heating but still running? The magnetron controls heating function. DIY repair in under 2 hours with basic tools and multimeter testing.
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This is a high voltage diode wire assembly used in the microwave's power circuit. It works with the capacitor and magnetron to convert electrical current and generate microwave energy for cooking. Replace this part if the microwave runs but does not heat, or if the diode has visibly burned or shorted out.