Buderus Incomplete Combustion / Sooting

Boiler room or flue area shows signs of soot or black staining

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 burner or heat exchanger, Incorrect gas/air ratio, Blocked flue, Inadequate combustion air supply

Safety: Risk of carbon monoxide. Turn off the boiler and ventilate the area immediately. Do not use the boiler until inspected.

1. Visual inspection: Look for soot around the flue connection and boiler casing joints.
2. Flue check: Ensure the flue is not blocked and that all joints are secure.
3. Burner and exchanger cleaning: A Buderus technician should remove and thoroughly clean the burner and primary heat exchanger.
4. Combustion analysis: A full combustion check and gas valve adjustment must be performed by a qualified gas engineer.

Professional Required 5/5

Burner / Primary Heat Exchanger / Flue System

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