Bomann
Overheating or Electrical Insulation Breakdown
Microwave has a strong burning or electrical smell during or after 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 residue burning on cavity walls or grill element, Overheating magnetron or transformer, Failing wiring insulation, Arcing at connectors
How to Fix / Troubleshooting
Safety: If you smell burning plastic or electrical insulation, unplug the microwave immediately and do not continue using it.
- Step 1 – Inspect cavity: Look for burnt food, grease buildup, or residue on the grill element or cavity walls. Clean thoroughly.
- Step 2 – Check external vents: Smell near the rear and sides. If the odor is stronger there, the internal components may be overheating.
- Step 3 – Internal inspection: With the cabinet removed (unplugged), look for discolored or melted wiring, burnt connectors, or charred components. Do not touch the HV parts.
- Step 4 – Professional repair: Any signs of burnt wiring or components require professional replacement and safety testing before the microwave is used again.
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Repair Difficulty
Hard
4/5
Required Part
Internal Wiring Harness
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