BoilerFaultCodes 423 High
Boiler Fault Code 423
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 423 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 shut down because the water inside has become dangerously overheated. (As reported on ECA FELiS FL 50 HM)
Pick your boiler brand for the 423 fix
Source
Information for the 423 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