Boiler Fault Code F.370

Also written as F370 — same fault.

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

Fault code F.370 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 has detected that a valve responsible for controlling the fuel supply is failing to shut off properly, which prevents it from operating safely. (As reported on Viessmann Vitodens 100-W WB1A)