Thermia
Sooting / Contaminated Airflow
Furnace causes a noticeable increase in dust or soot around supply registers.
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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
Improper combustion in Thermia burners, Leaking heat exchanger drawing flue gases into airflow, Dirty ducts, Negative pressure in home pulling in contaminants
How to Fix / Troubleshooting
Safety first: Soot can indicate dangerous combustion problems. Turn off the furnace and have it inspected.
- 1. Check filter: Replace a dirty or missing filter immediately.
- 2. Visual inspection: Look inside the burner compartment for soot deposits on the burners or heat exchanger. Soot indicates incomplete combustion.
- 3. Do not continue operation: A sooting furnace can produce high levels of carbon monoxide. Contact a licensed technician to inspect combustion, venting, and the Thermia heat exchanger.
- 4. Duct cleaning: After combustion issues are resolved, consider professional duct cleaning if dust buildup is severe.
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Repair Difficulty
Professional Required
5/5
Required Part
Primary Heat Exchanger
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