BoilerFaultCodes AA3333 High
Boiler Fault Code AA3333
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AA3333 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 is currently unable to safely remove waste gases from the system, so it has stopped working to prevent a risk of dangerous fumes entering your home. (As reported on Ariston Micro Condens)
Pick your boiler brand for the AA3333 fix
Source
Information for the AA3333 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 7 July 2026