BoilerFaultCodesAlpha 02 Fault Code
The Alpha 02 fault code means: your boiler has shut down because it has detected it is getting too hot, which is usually due to a lack of water flow through the system.. It appears on 23 Alpha models in our database.
Technical description: Overheat sensor has activated
DIY fix possible
Check that your radiator valves are open to ensure water can move freely.Check the boiler pressure gauge and top it up to 1.5 bar if it is low.Attempt to reset the boiler by turning the selector knob to the 'R' position for 5 seconds.Bleed your radiators to remove any trapped air that might be causing a blockage.
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Gas Safe Register →Alpha models that show the 02 fault code
Click a model for the full fault code list and model-specific repair notes.
- C25 Xtraflame Repair: £120-250
- CD Repair: £120-250
- E-Tec Repair: £120-250
- E-Tec 24 Repair: £120-250
- E-Tec 28 Repair: £120-250
- E-Tec 33 Repair: £120-250
- E-Tec Plus Repair: £120-250
- E-Tec Plus 10 / 18 Repair: £120-350
- E-Tec Plus 24 Repair: £120-250
- E-Tec Plus 28 Repair: £120-250
- E-Tec Plus 33 Repair: £120-250
- E-Tec R Repair: £150-300
- Eco Repair: £120-250
- Eco 11 13 Repair: £100-£350
- Evoke Repair: £120-250
- Evoke 10 / 18 Repair: £100-280
- H25 Xtraflame Repair: £120-250
- Intec 24GS Repair: £120-250
- Intec 28GS Repair: £120-250
- Intec 40GS2 Repair: £120-250
- Intec 50CS Repair: £120-250
- Intec2 25 28XE Repair: £120-250
- Intec2 30SE Repair: £120-250
Source
Alpha 02 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