Hoval Poor combustion / sooting

Burner flame appears yellow and sooty through the inspection window

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 head on Hoval burner, Incorrect gas/air ratio, Blocked combustion air intake, Wrong gas type or pressure

Safety: Sooting can lead to CO production. Turn off the furnace and gas supply.

Inspect air intake: Ensure the combustion air path is clear and vents are not blocked.
Clean burner: Remove the burner and clean the head and mixing passages with a soft brush and vacuum.
Check flue: Inspect for partial blockage that could affect draft.
Professional adjustment: A qualified Hoval technician must perform combustion analysis and adjust the gas valve and air settings.

Professional Required 5/5

Hoval Burner Assembly

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