BoilerFaultCodes 374 High
Boiler Fault Code 374
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 374 appears across 2 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's internal computer is experiencing an error while calculating its operating parameters, which prevents it from starting correctly. (As reported on ECA FELiS FL 50 HM)
Pick your boiler brand for the 374 fix
Source
Information for the 374 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