BoilerFaultCodes ALL 29 High
Boiler Fault Code ALL 29
Also written as ALL29 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code ALL 29 appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's internal electronic control systems are having trouble communicating with each other, which prevents the unit from starting correctly. (As reported on Sime Murelle Elite HE Combi)
Pick your boiler brand for the ALL 29 fix
Source
Information for the ALL 29 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