Siemens
Mechanical Vibration or Electrical Buzz
Microwave is excessively noisy (buzzing, humming, or rattling) 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
Loose cooling fan, worn turntable motor, failing high-voltage transformer, loose internal mounting screws
How to Fix / Troubleshooting
Safety warning: Unplug the microwave before moving or inspecting it. Do not operate with the cabinet removed.
Steps to try:
- 1. Check installation: Ensure the microwave is level and not touching adjacent cabinets or walls that can amplify vibration.
- 2. Remove loose items: Take out the glass tray and roller ring and test briefly. If the noise decreases, the issue may be with the turntable components.
- 3. Listen to noise type: A deep, loud hum may indicate a transformer issue; a rattling sound may point to a loose fan or panel.
- 4. Technician-level: Inspect internal fans, transformer mounts, and screws. Tighten or replace components as needed.
If the noise is accompanied by a burning smell or tripping breakers, stop using the microwave immediately.
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Repair Difficulty
Medium
3/5
Required Part
Cooling Fan Motor or High-Voltage Transformer
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