BoilerFaultCodes 281 A1 High
Boiler Fault Code 281 A1
Also written as 281A1 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 281 A1 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling because the internal water pump is either jammed or trapped air is preventing it from circulating water properly to your radiators. (As reported on Worcester Bosch Greenstar 12i System)
Pick your boiler brand for the 281 A1 fix
Source
Information for the 281 A1 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