b 29 High

Boiler Fault Code b 29

Also written as B29 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code b 29 appears across 2 boiler brands 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 is struggling to communicate with its internal air-flow system, which prevents it from safely igniting and providing heating or hot water. (As reported on Vokera Hydra)

Pick your boiler brand for the b 29 fix

Keston b 29 3 models Vokera b 29 1 model

Source

Information for the b 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 27 April 2026