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Abnormal Operating Noise
Microwave runs but makes loud buzzing, humming, or grinding noises during operation.
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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, Loose or vibrating high-voltage transformer, Turntable motor noise, Fan blade hitting housing or debris
How to Fix / Troubleshooting
Safety: Unplug before inspection. Do not operate with covers removed.
Steps:
- 1. Isolate source: Listen carefully to determine if the noise comes from the bottom (turntable motor), rear (transformer/fan), or side.
- 2. Check turntable: Remove the glass tray and support ring. Clean and re-seat them. Run briefly without the tray to see if noise changes.
- 3. Inspect fan: With the cover removed (unplugged), check that the fan blade is not rubbing against wiring or the shroud. Remove any debris.
- 4. Transformer/magnetron noise: A very loud, harsh buzz often indicates a failing magnetron or transformer. These require professional replacement.
If the noise is accompanied by a burning smell or smoke, stop using the microwave immediately and seek service.
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Repair Difficulty
Hard
4/5
Required Part
Cooling Fan Motor
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