BoilerFaultCodes A33 High
Boiler Fault Code A33
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code A33 appears across 2 boiler brands and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has stopped working because the internal fan, which safely pushes exhaust gases out of the flue, is not spinning at the correct speed. (As reported on Potterton Powermax HE)
Pick your boiler brand for the A33 fix
Source
Information for the A33 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