BoilerFaultCodes F.350 High
Boiler Fault Code F.350
Also written as F350 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.350 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 issue with the combustion process or ignition and has automatically locked itself out for safety reasons, meaning it will not produce heat or hot water. (As reported on Viessmann Vitodens 200-W B2KF Combi)
Pick your boiler brand for the F.350 fix
Source
Information for the F.350 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