BoilerFaultCodes 463 High
Boiler Fault Code 463
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 463 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 is pulling its own exhaust fumes back into the air intake, which prevents the burner from operating safely and efficiently. (As reported on Viessmann Vitodens 100-W B1GA)
Pick your boiler brand for the 463 fix
Source
Information for the 463 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