ECO-button not lit Low

Worcester Bosch ECO-button not lit Fault Code

Also written as ECOBUTTONNOTLIT — same fault.

The Worcester Bosch ECO-button not lit fault code means: 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.. It appears on 1 Worcester Bosch model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Economy mode.

DIY fix possible

Locate the ECO button on the front control panelPress the button once to toggle between economy and standard modeObserve if the light illuminates to confirm the boiler is back in standard operating mode

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Worcester Bosch models that show the ECO-button not lit fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch ECO-button not lit fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026