Princess
Abnormal Mechanical or High-Voltage Noise
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 high-voltage transformer, Shorted magnetron, Loose or vibrating cooling fan, Turntable motor bearings worn
How to Fix / Troubleshooting
Safety: Unplug the microwave if the noise is sudden, very loud, or accompanied by smell or smoke.
- Isolate source: Run the microwave briefly with an appropriate load (cup of water) and listen carefully to identify if the noise is from the bottom (turntable), back (transformer/fan), or side.
- Check turntable: Remove the glass tray and roller ring and run briefly. If the noise disappears, the issue is with the tray, ring, or coupler.
- If noise persists without tray: Internal components such as the fan, transformer, or magnetron may be failing and require professional diagnosis.
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Repair Difficulty
Hard
4/5
Required Part
High-Voltage Transformer
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