178 High

ECA 178 Fault Code

The ECA 178 fault code means: your boiler has shut down because it detected that the water in the heating system has become too hot, triggering a safety cut-out to prevent damage.. 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: Heating circuit 1 temperature limiter
Typical repair cost £100-280 (including labour)

DIY fix possible

Check that all radiator valves are fully open to ensure water can flow.Verify that the boiler pressure is between 1.0 and 1.5 bar on the gauge.Press the Reset button once to see if the fault clears after the system has cooled down.

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ECA models that show the 178 fault code

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

Source

ECA 178 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