Westinghouse Overheating Component or Food Residue Burning

Microwave has a burning smell or smoke 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

Food debris on cavity walls or waveguide cover,Overheated turntable motor or fan motor,Failing high-voltage transformer,Shorted wiring insulation

How to Fix / Troubleshooting

Safety first: Stop the microwave and unplug it immediately if you see smoke or smell burning plastic or wiring.

User-level steps:

  • 1. Inspect interior: Look for burnt food, splatters, or melted containers. Clean thoroughly.
  • 2. Check waveguide cover: Replace if burnt or discolored.
  • 3. Test with water only: After cleaning, heat a cup of water. If the burning smell persists without food, internal components may be overheating.

Advanced steps:

  • 4. Inspect motors and wiring: With the cover removed, look for discoloration, melted insulation, or burnt components around the fan, turntable motor, and transformer.

If any internal component shows signs of burning, discontinue use and have a technician replace the affected parts.

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Repair Difficulty

Hard 4/5

Required Part

Cooling Fan Motor
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