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How to get air out of a combi boiler?
Our boiler bangs and gurgles when the heating fires up, but the radiators are fine. Sounds like air in the system. How do you get it out?
Expert Trade Answers
"you will need a gas safe registered heating engineer to check your boiler,as noises from boiler can be caused by a multitude of issues,some of which might be critical safety issues"
Answered on 19th Aug 2026 - Member since Jan 2026 -
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"Check that there is water in the heating system and boiler.
Bleed radiators of air and check any visible pressure guage is not reading zero pressure.
Banging boiler on start up can be a sticking pump due to wear and tear or poor water quality.
Stuck auto air vent or heat exchanger scaled or dirty due to poor water quality.
Don't attempted to examine the boiler or remove the case. If the pressure is correct there is nothing more you can do. Get a Gas safe registered engineer to attend to check the issue."
Bleed radiators of air and check any visible pressure guage is not reading zero pressure.
Banging boiler on start up can be a sticking pump due to wear and tear or poor water quality.
Stuck auto air vent or heat exchanger scaled or dirty due to poor water quality.
Don't attempted to examine the boiler or remove the case. If the pressure is correct there is nothing more you can do. Get a Gas safe registered engineer to attend to check the issue."
Answered on 19th Aug 2026 - Member since Jul 2025 -
report
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