BoilerFaultCodesAlpha 75 Fault Code
The Alpha 75 fault code means: your boiler is struggling to accurately monitor the temperature of the water circulating through your heating system, so it has shut down as a precaution to prevent overheating.. It appears on 14 Alpha models in our database.
Technical description: Return and/or flow sensor malfunction
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Alpha models that show the 75 fault code
Click a model for the full fault code list and model-specific repair notes.
- E-Tec 28 Repair: £120-220
- E-Tec 33 Repair: £120-220
- E-Tec NX Repair: £150-250
- E-Tec NXS Repair: £120-220
- E-Tec Plus Repair: £120-220
- E-Tec Plus 10 / 18 Repair: £120-190
- E-Tec Plus 28 Repair: £120-220
- E-Tec Plus 33 Repair: £120-220
- E-Tec Plus NX Repair: £150-250
- E-Tec Regular Repair: £150-250
- E-Tec S Repair: £150-250
- Evoke Repair: £150-250
- Evoke 10 / 18 Repair: £90-160
- Evoke NX Repair: £120-220
Source
Alpha 75 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 7 July 2026