Why is my boiler making strange noises?
By LM Plumbers 2025
Common causes of noisy boilers
Where is the noise coming from?
Check for an error first!
The boiler is making a buzzing noise
The boiler is ‘swooshing’ or vibrating
Time to check the air filter
Check the flue
A gurgling noise from the boiler
Bleed the system
Check the circulation pump
In summary
Easy checklist to fix strange boiler noises
- Check the error display – modern boilers show error codes that can highlight the issue
- Listen carefully – buzzing often indicates faulty parts, while gurgling may mean trapped air.
- Bleed your radiators – trapped air in the system is a common cause of gurgling noises
- Inspect the air filter – clean it if you notice debris or blockages.
- Check the external flue – ensure airflow is clear and unobstructed
- Review the water pressure – should generally sit around 1.0–1.5 bar.