BoilerFaultCodes A55 High
Boiler Fault Code A55
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code A55 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's internal computer has encountered a critical electronic failure and can no longer control the heating or hot water safely. (As reported on Ferroli Bluehelix Tech)
Pick your boiler brand for the A55 fix
Source
Information for the A55 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