Junkers Incomplete Combustion / Sooting

Furnace runs but flue terminal emits visible soot or dark smoke

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 on Junkers furnace, Blocked or restricted flue, Wrong gas type setting

Safety first: Turn off the furnace and gas supply immediately. Sooting indicates dangerous combustion.

1. Do not operate: Do not use the furnace until it has been inspected and repaired.
2. Flue inspection: Have a technician inspect and clear any flue blockages.
3. Burner cleaning: The burner should be removed and thoroughly cleaned or replaced.
4. Combustion adjustment: A qualified technician must check and adjust combustion using a flue gas analyser and verify correct gas type configuration.

Professional Required 5/5

Burner Assembly

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