127 Medium

ECA 127 Fault Code

The ECA 127 fault code means: your boiler has failed to heat the stored water to a high enough temperature to kill off bacteria, usually because the hot water hasn't been used for a while or the heating cycle timed out.. It appears on 1 ECA model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: DHW legionella temperature not reached
Typical repair cost £0-120 (including labour)

DIY fix possible

Check that the hot water temperature is set high enough on the boiler control panel (typically 60°C or above).Ensure there is no current high demand for hot water elsewhere in the home during the disinfection cycle.Restart the boiler to allow it to attempt the anti-legionella heating cycle again.

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ECA models that show the 127 fault code

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

Source

ECA 127 fault code information on this page is sourced and cross-checked against the official ECA service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026