Dettson Incomplete Combustion / Sooting

Dettson furnace produces visible soot around the exhaust or on nearby surfaces.

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.

Possible Causes

Blocked burners, Incorrect gas pressure, Insufficient combustion air, Cracked or blocked heat exchanger

How to Fix / Troubleshooting

Critical safety warning: Sooting indicates dangerous combustion and potential carbon monoxide production. Turn off the furnace and gas supply immediately and ventilate the area.

1. Do not operate furnace: Leave the furnace off until inspected.
2. Call a qualified technician: A full combustion analysis, burner cleaning, and heat exchanger inspection are required.
3. Install or test CO detectors: Ensure carbon monoxide detectors are installed and functioning on each level of the home.

Repair Difficulty

Professional Required 5/5

Required Part

Burner Assembly

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