ECO-button lit Low

Worcester Bosch ECO-button lit Fault Code

Also written as ECOBUTTONLIT — same fault.

The Worcester Bosch ECO-button lit fault code means: your boiler is currently in 'comfort mode', which means it keeps a small amount of water hot inside the unit so that your taps get warm faster.. 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: Comfort mode

DIY fix possible

Locate the ECO button on the front control panelPress and hold the ECO button until the light turns off to deactivate Comfort modePress and hold the button again if you wish to re-enable the feature

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Worcester Bosch models that show the ECO-button lit fault code

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

Source

Worcester Bosch ECO-button 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