Glow-worm
Mechanical Noise from Fan, Pump, or Combustion
Boiler is very noisy during operation (whining, grinding, or rattling)
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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
Worn fan bearings, Seized or cavitating pump, Loose casing panels or pipe clips, Combustion instability.
How to Fix / Troubleshooting
Safety: Isolate the power supply before touching the boiler casing. Do not remove the combustion cover unless you are qualified.
- Identify noise source: Stand near the boiler and note whether the noise originates from the top (fan), bottom (pump), or from casing vibration.
- Check casing screws: Ensure the front and side panels are securely fastened to reduce rattling.
- Check pipe supports: Secure any loose pipes that may be vibrating against walls or other pipes.
- Engineer tasks:
- Inspect and replace a noisy fan assembly or circulation pump.
- Check combustion settings if the noise is combustion-related (roaring or rumbling).
Persistent mechanical noise usually indicates a component nearing the end of its service life.
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Repair Difficulty
Medium
3/5
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