Klimosz Combustion Noise / Resonance

Boiler is very noisy during operation, with whistling or howling sounds.

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 on Klimosz burner, Partially blocked burner ports, Loose burner mounting, Fan speed control issues

Safety: Combustion adjustments must be done with proper equipment.

Check for loose parts: With power off, inspect burner mounting screws, fan housing, and panels for looseness. Tighten as needed.
Clean burner: Remove and clean the burner head to ensure all ports are clear.
Combustion adjustment: A qualified Klimosz technician should check and adjust gas valve settings using a flue gas analyzer to eliminate resonance.
Fan check: Verify that the fan runs smoothly without wobble. Replace if bearings are noisy.

Hard 4/5

Burner Assembly

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