Toshiba Overheating Component or Food Residue Burning

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 walls,Overheating magnetron or wiring,Arcing at waveguide cover,Burned turntable motor or fan motor winding

How to Fix / Troubleshooting

Safety warning: If you smell burning plastic or electrical insulation, unplug the microwave immediately.

Steps to identify the source:

  • 1. Inspect interior: After cooling, check for burned food, splatters, or melted plastic containers. Clean thoroughly with mild detergent.
  • 2. Check waveguide cover: Look at the mica or plastic cover on the side wall (waveguide cover). If it is charred, cracked, or has burn marks, discontinue use.
  • 3. Observe during short test: With a cup of water inside, run a 20–30 second test while closely monitoring for smell or visible smoke. Be ready to stop immediately.

If smell persists or is electrical: Internal components such as the magnetron, wiring, or motors may be overheating. Do not use the microwave; have it inspected and repaired by a Toshiba technician.

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Repair Difficulty

Hard 4/5

Required Part

Waveguide Cover
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