Worcester
Combustion Noise / Incorrect Gas-Air Ratio
Boiler is very noisy during operation, with whistling, droning, or rumbling sounds from the combustion chamber.
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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
Incorrectly adjusted Worcester gas valve, partially blocked burner, fan speed issues, flue restriction causing resonance
How to Fix / Troubleshooting
Safety first: Combustion adjustments must only be made by a Gas Safe engineer with a flue gas analyser.
Homeowner checks:
- Note when the noise occurs (start-up, full fire, modulation) and report to the engineer.
- Check that the flue terminal is not obstructed.
Engineer actions:
- Inspect and clean the burner and combustion chamber.
- Check fan operation and speed feedback.
- Set gas valve and combustion parameters according to Worcester specifications using a calibrated analyser.
- Verify flue installation and support to reduce resonance.
Persistent combustion noise can indicate unsafe operation and should be investigated promptly.
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Repair Difficulty
Professional Required
5/5
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