125 High

ECA 125 Fault Code

The ECA 125 fault code means: your boiler has shut down because the internal water temperature has become too hot.. It appears on 1 ECA model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Maximum boiler temperature exceeded
Typical repair cost £120-350 (including labour)

DIY fix possible

Check that your radiator valves are open to allow water to flow.Ensure the boiler pressure gauge is between 1 and 1.5 bar.Reset the boiler using the control panel after it has cooled down.

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ECA models that show the 125 fault code

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

Source

ECA 125 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