BoilerFaultCodes E129 High
Boiler Fault Code E129
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E129 appears across 2 boiler brands and 29 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 keep its flame lit while trying to automatically adjust its settings for efficient burning. (As reported on Potterton Promax HE)
Pick your boiler brand for the E129 fix
Source
Information for the E129 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