153 Medium

ECA 153 Fault Code

The ECA 153 fault code means: your boiler has been manually locked, likely by someone pressing the reset button for too long or a technician during maintenance.. 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: The device is locked manually
Typical repair cost £0-80 (including labour)

DIY fix possible

Locate the Reset button on the boiler control panel.Press and hold the Reset button for approximately 3 seconds.Wait for the display to clear and the boiler to restart its ignition sequence.

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ECA models that show the 153 fault code

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

Source

ECA 153 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