BoilerFaultCodesWorcester Bosch ECO Fault Code
The Worcester Bosch ECO fault code means: your boiler is simply in energy-saving mode, which means it will not pre-heat your hot water in order to save on fuel costs.. It appears on 1 Worcester Bosch model in our database.
Technical description: Eco mode is active
What causes the Worcester Bosch ECO fault?
This is not a mechanical failure but a user-selected settings choice. It occurs when the 'Eco' button has been pressed, instructing the boiler to disable the internal pre-heat function which normally keeps a small reservoir of water hot at all times. While this saves money on heating bills, it means you may have to wait a little longer for hot water to reach your taps.
DIY fix possible
Locate the ECO button on the boiler control panelPress and hold the ECO button until the light turns off if you prefer instant hot waterLeave the setting as it is if you wish to continue saving energy
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Gas Safe Register →Worcester Bosch models that show the ECO fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch ECO 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