ACV
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 valve adjustment, Blocked or damaged burner, Flue resonance, Loose combustion chamber components
How to Fix / Troubleshooting
Safety first: Abnormal combustion noise can indicate unsafe operation. Do not ignore it.
- Check flue terminal: Ensure nothing is obstructing the flue outlet that could cause whistling.
- Note operating conditions: Observe whether the noise occurs at low, high, or all firing rates and report this to the technician.
- Do not adjust gas settings: Only a qualified technician should adjust combustion on ACV boilers.
- Professional service: A technician should inspect the burner, clean the heat exchanger, check flue installation, and set combustion correctly.
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Repair Difficulty
Hard
4/5
Required Part
Gas Burner Assembly
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