Boiler Fault Code F.357

Also written as F357 — same fault.

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

Fault code F.357 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 is struggling to get enough gas to stay lit, which means it cannot provide heating or hot water until the supply is restored. (As reported on Viessmann Vitodens 222-F B2TF)