BoilerFaultCodes C28 High
Boiler Fault Code C28
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code C28 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected an issue with the internal fan responsible for safely venting combustion gases, so it has stopped working to prevent unsafe operation. (As reported on Atag Premier)
Pick your boiler brand for the C28 fix
Source
Information for the C28 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026