BoilerFaultCodes
British Gas Boiler Fault Codes
58 fault codes across 2 British Gas boiler models — explained in plain English.
British Gas-badged domestic boilers (built by Glow-worm/Worcester).
British Gas fault codes on this site
We document 58 fault codes across 2 British Gas models, covering 58 distinct codes. British Gas boilers use letter-and-number codes such as F78, S.00, S.02. Codes for 2 of these models are taken directly from the manufacturer's own service or installation manual. British Gas is a smaller name in the UK market, and if you own one this is likely one of the few places its fault codes are collected in one place.
Models covered: 330+, RD 430i.
Just want the most common British Gas problems?
The top 8 faults across the whole British Gas range — causes, DIY checks, repair costs.
High-severity British Gas fault codes
F78 S.32 S.42 S.53 S.54
Your boiler has lost communication with its external controls or internal wiring kit, preventing it from heating your home.
330+
Your boiler has paused because it is detecting a problem with the fan that helps clear waste gases, likely due to a temporary electrical hiccup or a part wearing out.
330+
Your boiler has temporarily stopped working because an external add-on, such as a smart thermostat or a pump controller, is preventing it from firing up.
330+
Your boiler has paused because the heat is building up too quickly and cannot be moved away fast enough through the pipes.
330+
Your boiler has detected that water is not circulating properly, causing it to heat up too quickly and shut down to prevent damage.
330+
All models
2 British Gas boiler models
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