BoilerFaultCodes 355 High
Boiler Fault Code 355
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 355 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 unusual reading from the flame detection system while trying to start, preventing the burner from igniting safely. (As reported on Viessmann Vitodens 100-W B1GA)
Pick your boiler brand for the 355 fix
Source
Information for the 355 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