Danstoker
Incomplete Combustion / Sooting
Visible smoke or soot at the flue outlet of a Danstoker boiler; dark exhaust.
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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 air-fuel ratio, Dirty burner nozzle or head, Blocked air intake, Fouled Danstoker heat exchanger increasing backpressure
How to Fix / Troubleshooting
Safety: Sooting can lead to dangerous CO levels. Shut down the boiler and ventilate the area.
- Inspect burner: Remove and clean the burner head, nozzle, and air passages. Replace worn nozzles.
- Check air supply: Ensure combustion air openings are unobstructed and fan is operating correctly.
- Clean heat exchanger: Brush and vacuum soot from boiler tubes and passes.
- Combustion tuning: Have a qualified technician adjust the burner using a flue gas analyzer to achieve correct CO2/O2 and CO levels.
Do not operate the boiler with visible smoke; correct combustion issues first.
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Repair Difficulty
Hard
4/5
Required Part
Burner Nozzle / Burner Head
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