Buderus
Combustion Noise / Resonance
Boiler is very noisy (whistling, roaring, or droning) when firing
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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 gas/air ratio, Blocked or incorrectly installed flue, Loose burner components, Worn fan bearings
How to Fix / Troubleshooting
Safety: Combustion adjustments must be done by a gas-qualified technician.
- 1. Check flue terminal: Ensure the flue outlet is not obstructed and that any terminal guards are correctly fitted.
- 2. Listen for fan noise: A high-pitched whine may indicate worn fan bearings; replace the fan assembly.
- 3. Burner inspection: A technician should inspect the burner for damage or misalignment and clean it if necessary.
- 4. Combustion setup: A Buderus-trained engineer should check and adjust the gas valve and perform a flue gas analysis to ensure correct combustion.
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Repair Difficulty
Hard
4/5
Required Part
Fan Assembly / Burner / Gas Valve
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