Bush Overheating Component or Cavity Contamination

The microwave runs, but there is a strong burning or an electrical odor.

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

Food residue burning on cavity walls, failing magnetron or transformer, overheated wiring or connectors, burnt waveguide cover

Immediate action: Stop the microwave and unplug it if you smell burning plastic or an electrical odor.

Inspect cavity: Once cooled, clean any burnt-on food or grease, especially around the waveguide cover and ceiling.
Check waveguide cover: Replace if browned, warped, or burnt.
Internal inspection: With the cover removed (and unit unplugged), look for discolored wiring, melted insulation, or burnt components near the magnetron and transformer.

If the smell persists after cleaning and there are signs of internal overheating, discontinue use and have the unit inspected professionally.

Hard 4/5

Waveguide Cover

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