BoilerFaultCodesAlpha 01 Fault Code
The Alpha 01 fault code means: your boiler has detected that it cannot safely remove waste combustion gases, so it has shut itself down to prevent a carbon monoxide hazard.. It appears on 22 Alpha models in our database.
Technical description: Blocked flue/condensate or fan fault
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A cover plan would handle faults like 01: no call-out fees, no surprise bills.
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Alpha models that show the 01 fault code
Click a model for the full fault code list and model-specific repair notes.
- CD18 / CD24 Repair: £150-350
- E-Tec 28 Repair: £120-250
- E-Tec 33 Repair: £120-250
- E-Tec NX Repair: £100-£280
- E-Tec NXS Repair: £100-280
- E-Tec Plus Repair: £120-250
- E-Tec Plus 10 / 18 Repair: £100-280
- E-Tec Plus 28 Repair: £120-250
- E-Tec Plus 33 Repair: £120-250
- E-Tec Plus NX Repair: £100-£350
- E-Tec Regular Repair: £120-250
- E-Tec S Repair: £100-£300
- Eco Repair: £120-250
- Eco 11 13 Repair: £120-350
- Evoke Repair: £120-250
- Evoke 10 / 18 Repair: £100-280
- Evoke NX Repair: £100-350
- Intec 40GS2 Repair: £120-250
- Intec 50CS Repair: £150-300
- Intec S Repair: £120-250
- Intec2 25 28XE Repair: £120-250
- Intec2 30SE Repair: £120-250
Source
Alpha 01 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