E15 High

ECA E15 Fault Code

The ECA E15 fault code means: your boiler has shut down because its internal temperature sensors are giving conflicting readings and can no longer monitor the heat safely.. It appears on 3 ECA models 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: Measurement deviation fault of temperature sensors (lockout) — sensors may be defective; press Reset; if persists notify ECA authorised service
Typical repair cost £100-190 (including labour)

DIY fix possible

Locate the Reset button on the boiler control panelPress and hold the Reset button for 3 secondsWait for the boiler to restart; if the code returns, you must call a Gas Safe engineer

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ECA models that show the E15 fault code

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

Source

ECA E15 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 31 August 2026