BoilerFaultCodes A1281 High
Boiler Fault Code A1281
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code A1281 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's internal pump is either jammed or struggling to move water because there is too much trapped air in the system. (As reported on Worcester Bosch Greenstar Si Combi / i System)
Pick your boiler brand for the A1281 fix
Source
Information for the A1281 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