BoilerFaultCodes F.448 High
Boiler Fault Code F.448
Also written as F448 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.448 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 internal issue and has safely shut itself down to prevent damage, meaning you currently have no heating or hot water. (As reported on Viessmann Vitodens 200-W B2KF Combi)
Pick your boiler brand for the F.448 fix
Source
Information for the F.448 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