BoilerFaultCodes E01-374 High
Boiler Fault Code E01-374
Also written as E01374 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E01-374 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has failed to ignite or stay lit, meaning it cannot produce heat or hot water because it has lost its flame signal. (As reported on Ideal Mexico Super 100FF / 125FF)
Pick your boiler brand for the E01-374 fix
Source
Information for the E01-374 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 27 April 2026