Emerson Overheating Component or Electrical Arcing

Microwave emits a burning or electrical smell during or after use.

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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

Food or grease burning on cavity surfaces, Arcing at damaged waveguide cover, Overheating wiring or connectors, Failing magnetron or transformer

How to Fix / Troubleshooting

Safety first: If you smell burning plastic or electrical odor, stop the microwave and unplug it.

Interior cleaning:

  • Inspect the cavity for burnt food, grease buildup, or splatters. Clean thoroughly with a non-abrasive cleaner and dry.
  • Check the waveguide cover for burn marks or holes; replace if damaged.

Internal inspection (unplugged):

  • Remove the outer cabinet and look for discolored or melted wiring, especially near the high-voltage components and fan.

If the smell persists after cleaning or you see damaged components, do not use the microwave until inspected by a technician.

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Repair Difficulty

Hard 4/5

Required Part

Waveguide Cover
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