BoilerFaultCodes F.381 High
Boiler Fault Code F.381
Also written as F381 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.381 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 stopped working because it cannot maintain a steady flame, which means it is unable to produce heat or hot water. (As reported on Viessmann Vitodens 100-W WB1A)
Pick your boiler brand for the F.381 fix
Source
Information for the F.381 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