When a microwave oven runs normally, turns its turntable, and illuminates its internal light but completely fails to heat up food placed inside, it indicates a sudden failure within the high-voltage heating circuit. Common culprits include a blown high-voltage ceramic fuse, a defective high-voltage capacitor, a failed high-voltage diode, or a burned-out magnetron tube that no longer generates electromagnetic waves. You can troubleshoot high-voltage components safely after discharging capacitors. You can verify that your corrective action is successful when testing continuity across high-voltage parts and replacing the blown fuse, faulty diode, or dead magnetron restores normal heating capability to the microwave.
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