BoilerFaultCodesAlpha E15 Fault Code
The Alpha E15 fault code means: your boiler has lost the ability to accurately measure the temperature of the water returning to it, so it has shut down as a precaution to prevent overheating or running inefficiently.. It appears on 23 Alpha models in our database.
Technical description: Return probe failure
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Alpha models that show the E15 fault code
Click a model for the full fault code list and model-specific repair notes.
- C25 Xtraflame Repair: £150-300
- CD24 Repair: £120-200
- CD28 Repair: £100-200
- E-Tec Repair: £120-200
- E-Tec 24 Repair: £120-200
- E-Tec 28 Repair: £120-200
- E-Tec 33 Repair: £120-200
- E-Tec Plus Repair: £120-220
- E-Tec Plus 10 / 18 Repair: £90-160
- E-Tec Plus 24 Repair: £120-220
- E-Tec Plus 28 Repair: £120-220
- E-Tec Plus 33 Repair: £120-220
- E-Tec R Repair: £120-220
- Evoke Repair: £120-250
- Evoke 10 / 18 Repair: £100-£350
- H25 Xtraflame Repair: £150-300
- Intec 28GS Repair: £150-300
- Intec 40GS2 Repair: £120-250
- Intec 50CS Repair: £150-300
- Intec2 25 28XE Repair: £120-220
- Intec2 30SE Repair: £120-200
- Pro Tec 24 Repair: £120-200
- Pro Tec Plus Repair: £120-200
Source
Alpha E15 fault code information on this page is sourced and cross-checked against the official Alpha service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026