BoilerFaultCodes ECO-button not lit Low
Boiler Fault Code ECO-button not lit
Also written as ECOBUTTONNOTLIT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code ECO-button not lit 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 is currently running in its energy-saving mode, meaning it will take slightly longer to provide hot water but uses less gas to keep the system warm. (As reported on Worcester Bosch Greenstar 25 HE Combi)
Pick your boiler brand for the ECO-button not lit fix
Source
Information for the ECO-button not lit 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