BoilerFaultCodes A56 High
Boiler Fault Code A56
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code A56 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 having trouble setting up its gas and air mixture correctly, which prevents it from firing up safely. (As reported on Ferroli Bluehelix Tech)
Pick your boiler brand for the A56 fix
Source
Information for the A56 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