BoilerFaultCodes 449 High
Boiler Fault Code 449
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 449 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's computer system has encountered an internal software timing error that is preventing it from running its startup sequence correctly. (As reported on Viessmann Vitodens 100-W B1GA)
Pick your boiler brand for the 449 fix
Source
Information for the 449 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