ECO Low

Boiler Fault Code ECO

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code ECO appears across 2 boiler brands 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 is currently set to an energy-saving mode because your hot water temperature has dropped below 50°C, often occurring after a high demand for water. (As reported on Glow-worm Ultracom 2 SXI)

Pick your boiler brand for the ECO fix

Glow-worm ECO 2 models Worcester Bosch ECO 1 model

Source

Information for the ECO 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