Buderus Sooting / Incomplete Combustion

Visible soot around burner or in flue, black staining near vent termination

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

Incorrect gas/air ratio, Blocked burner or heat exchanger, Insufficient combustion air, Wrong orifice or fuel type

Safety: Sooting indicates a serious combustion problem and potential carbon monoxide hazard. Turn off power and gas immediately.

Steps:

Do not operate: Leave the furnace off until inspected.
Check air supply: Ensure combustion air openings or intake pipes are not blocked.
Vent inspection: Look for obvious blockages at the vent termination.

Combustion adjustments, burner cleaning, and verification must be performed by a qualified Buderus technician with a combustion analyzer.

Professional Required 5/5

Buderus Burner Assembly

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