BoilerFaultCodes F.428 High
Boiler Fault Code F.428
Also written as F428 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.428 appears across 1 boiler brand and 1 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 fault within the fan system that draws clean air in, preventing it from starting up safely. (As reported on Viessmann Vitodens 100-W WB1A)
Pick your boiler brand for the F.428 fix
Source
Information for the F.428 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