Emerson
Noisy High Voltage Component or Magnetron
Microwave makes loud buzzing or humming noise while running, louder than normal, sometimes accompanied by a burning smell.
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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, Shorted high-voltage diode, Saturated high-voltage transformer, Arcing in waveguide or cavity
How to Fix / Troubleshooting
Safety warning: Loud buzzing with smell can indicate dangerous arcing. Stop the microwave immediately and unplug it.
User checks:
- Inspect the interior for burn marks, chipped paint, or exposed metal, especially near the waveguide cover.
- Check the mica waveguide cover for burns or holes; replace if damaged.
High-voltage diagnosis and repair should be performed only by a qualified technician. Continued use can cause further damage or fire.
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Repair Difficulty
Professional Required
5/5
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