Dettson Poor Combustion / Sooting

Boiler vent terminal outside shows signs of sooting or black staining

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

Incorrect gas pressure, Dirty Dettson burner, Blocked heat exchanger, Insufficient combustion air

How to Fix / Troubleshooting

Safety: Sooting indicates dangerous combustion and potential carbon monoxide production. Turn off the boiler and do not operate it until serviced.

Check vent and intake: Ensure both are clear of obstructions and properly installed.
Professional combustion analysis: A licensed technician must clean the burner and heat exchanger, verify gas pressure, and adjust combustion to Dettson specifications.

Repair Difficulty

Professional Required 5/5

Required Part

Dettson burner assembly

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