Microwave makes loud buzzing or humming noise during operation, louder than normal, sometimes with a burning smell.
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.
Possible Causes
How to Fix / Troubleshooting
Critical safety warning: Loud buzzing from the high-voltage area can indicate imminent component failure. Unplug the microwave immediately.
User-level actions:
- 1. Stop using the appliance: Continued operation can cause further damage or fire.
- 2. Visual inspection: With the cabinet removed (if you are comfortable), look for burn marks or melted insulation near the transformer, capacitor, diode, and magnetron. Do not touch these parts.
High-voltage diagnosis and replacement must be performed by a qualified technician. Do not attempt to run the microwave again until repaired.
Repair Difficulty
Required Part
We may earn a commission from links on this page.