BoilerFaultCodes 01 Emergency
Alpha 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 23 Alpha models in our database.
Technical description: Blocked flue/condensate or fan fault
Typical repair cost £150-350 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Alpha models that show the 01 fault code
Click a model for the full fault code list and model-specific repair notes.
- C25 Xtraflame Repair: £150-300
- CD Repair: £150-350
- 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: £100-280
- 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: £120-250
- Eco Repair: £120-250
- Eco 11 13 Repair: £120-350
- Evoke Repair: £120-250
- Evoke 10 / 18 Repair: £100-280
- H25 Xtraflame Repair: £150-300
- Intec 24GS Repair: £120-250
- Intec 28GS Repair: £150-300
- Intec 40GS2 Repair: £120-250
- Intec 50CS Repair: £150-300
- 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 27 April 2026