Boiler Fault Code AA 0011

Also written as AA0011 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code AA 0011 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has failed to light the flame three times in a row, so it has locked itself out to prevent a gas buildup. (As reported on Ariston Clas One)