Monogram
Noisy High-Voltage or Mechanical Component
Microwave makes loud buzzing, humming, or grinding noises during operation, louder than normal fan noise.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failing magnetron, noisy high-voltage transformer or inverter, loose mounting hardware, worn turntable motor, debris in fan blades
How to Fix / Troubleshooting
Safety: Unplug the microwave before inspection. Do not operate with covers removed.
- Isolate noise source: Listen carefully to determine if the noise is coming from the top, side, or bottom of the unit.
- Check turntable: Remove the glass tray and support ring, then run the microwave with a microwave-safe load of water. If the noise decreases, the turntable motor or support may be noisy.
- Inspect fan and mounts: A technician can inspect the cooling fan, convection fan, and magnetron mounts for loose screws or debris.
- High-voltage noise: A loud, deep hum often indicates a failing magnetron or transformer/inverter, which should be replaced by a professional.
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Repair Difficulty
Hard
4/5
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