A Samsung over-the-range microwave that powers on, illuminates its interior light, and spins the turntable but fails to actually heat food is usually experiencing a failure in its high-voltage electrical components. The most frequent culprit is a burned-out magnetron, which generates the actual microwave energy, or a blown high-voltage diode and capacitor responsible for supplying the necessary electrical voltage. Another common cause is a tripped thermal protector fuse designed to shut down heating elements if the unit detects overheating caused by blocked ventilation or heavy stovetop steam exposure. Additionally, faulty door interlock switches that fail to signal a secure closure can prevent the high-voltage circuit from engaging, requiring professional multimeter testing and component replacement.
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