BoilerFaultCodes F.429 High
Boiler Fault Code F.429
Also written as F429 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.429 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 detected an issue with the fan system that controls the airflow needed for safe and efficient combustion, causing it to shut down for safety. (As reported on Viessmann Vitodens 100-W WB1A)
Pick your boiler brand for the F.429 fix
Source
Information for the F.429 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