Lennox
Overheating Components / Electrical Fault
Strong burning or electrical smell when furnace runs.
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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 burning off heat exchanger after long off period, Overheating blower motor, Loose electrical connections on Lennox control board, Shorted wiring harness
How to Fix / Troubleshooting
Safety: If you see smoke or smell strong burning plastic, shut off power immediately.
- 1. Initial use smell: A mild burning dust smell for the first 1–2 heating cycles can be normal. If it persists, investigate further.
- 2. Inspect wiring: With power off, check for discolored or melted wires at the control board and blower.
- 3. Check motor temperature: If the blower motor is extremely hot to touch, it may be failing.
Electrical burning smells require prompt professional diagnosis.
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Repair Difficulty
Hard
4/5
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