BoilerFaultCodes 450 High
Boiler Fault Code 450
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 450 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 has encountered an internal error while trying to process its operating software, causing the system to stop working. (As reported on Viessmann Vitodens 100-W B1GA)
Pick your boiler brand for the 450 fix
Source
Information for the 450 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