Bosch
Overheating Components or Dust Burn-Off
Furnace emits a burning smell or plastic odor when running
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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
Dust accumulation on heat exchanger or elements, Wiring insulation overheating, Foreign object touching hot surfaces, Blower motor overheating
How to Fix / Troubleshooting
Safety: If you see smoke or suspect an electrical fire, turn off power immediately and call emergency services.
- New or recently serviced unit: A mild odor for the first few hours of operation can be normal as oils and dust burn off. This should dissipate quickly.
- Clean interior: With power off, vacuum dust from accessible surfaces, especially around the heat exchanger and blower.
- Inspect wiring: Look for discolored or melted insulation near hot components. Do not operate the furnace if such damage is found.
Persistent strong odors require professional inspection.
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Repair Difficulty
Medium
3/5
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