Boiler Fault Code F.029

Also written as F029 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code F.029 appears across 1 boiler brand and 3 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 it cannot detect a flame, most likely because it is not receiving enough gas to stay lit. (As reported on Vaillant ecoTEC Plus 836)