Boiler is excessively noisy during operation (whining, grinding, or rattling sounds).
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Noise alone is not usually dangerous, but it may indicate impending component failure.
User-level checks:
- Check that the boiler casing is properly secured and that no external objects are touching it.
- Listen to identify whether the noise occurs during heating, hot water, or both.
Technical checks (qualified personnel):
- Isolate power and inspect fan and pump for play in the shafts or signs of wear.
- Tighten any loose mounting screws or brackets.
- Replace noisy fan or pump assemblies.
- Check flue supports and joints for vibration and secure as needed.
After repairs, run the boiler in both CH and DHW modes to confirm quiet operation.
Repair Difficulty
Required Part
We may earn a commission from links on this page.