BoilerFaultCodes F.385 High
Boiler Fault Code F.385
Also written as F385 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.385 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 an electrical issue with the flame sensor, meaning it cannot safely confirm a flame is present and has turned itself off to stay secure. (As reported on Viessmann Vitodens 100-W WB1A)
Pick your boiler brand for the F.385 fix
Source
Information for the F.385 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