BoilerCodes explains boiler fault codes in plain English for UK homeowners.
Every code meaning on this site comes from the manufacturer's own published fault code lists, user manuals and help pages, which we link at the bottom of each page. Where we tell you to do something yourself, we check it against at least two of the manufacturer's own documents.
We only describe checks that manufacturers say homeowners can do, such as topping up the pressure, checking the gas supply, thawing a frozen condensate pipe or resetting the boiler. Anything else is a job for a Gas Safe registered engineer.
BoilerCodes is independent. We are not affiliated with or endorsed by any boiler manufacturer.