Viadrus
Sooting / Incomplete Combustion
Black soot deposits around the flue outlet and on the heat exchanger surfaces, with dark smoke from chimney.
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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
Incorrect burner adjustment on Viadrus furnace, Blocked air intake, Dirty burner head or oil nozzle, Wrong fuel type or pressure
How to Fix / Troubleshooting
Safety: Sooting can lead to dangerous carbon monoxide levels. Turn off the furnace and do not operate it until corrected.
- Inspect air intake: Ensure the combustion air openings around the furnace and any dedicated air ducts are not blocked.
- Clean heat exchanger: A technician should open the Viadrus heat exchanger doors and brush/vacuum soot from the cast‑iron sections and flueways.
- Burner service: Have a qualified burner technician clean the burner, replace the oil nozzle (if oil‑fired), check gas pressure (if gas‑fired), and adjust air/fuel ratio using a combustion analyzer.
- Check fuel: Verify that the correct fuel type and quality specified by Viadrus is being used.
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Repair Difficulty
Professional Required
5/5
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