BoilerFaultCodes F.454 High
Boiler Fault Code F.454
Also written as F454 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.454 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's computer is reporting that its internal operating software is incompatible or corrupt, which prevents the burner from safely starting up. (As reported on Viessmann Vitodens 100-W WB1A)
Pick your boiler brand for the F.454 fix
Source
Information for the F.454 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