BoilerFaultCodes E03 Emergency
Alpha E03 Fault Code
The Alpha E03 fault code means: your boiler has detected an issue with the airflow or ventilation system, and for safety reasons, it has turned itself off to prevent harmful gases from escaping.. It appears on 29 Alpha models in our database.
Technical description: Flue thermostat or pressure switch fault
Typical repair cost £150-300 (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 E03 fault code
Click a model for the full fault code list and model-specific repair notes.
- C25 Xtraflame Repair: £150-300
- CB24 Repair: £150-300
- CB28 Repair: £120-250
- Cb50 Repair: £150-300
- Cd13r Repair: £150-300
- CD24 Repair: £120-250
- Cd25 Repair: £120-280
- CD28 Repair: £150-300
- 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: £120-280
- 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: £150-300
- Evoke Repair: £120-250
- Evoke 10 / 18 Repair: £120-250
- H25 Xtraflame Repair: £150-300
- Intec 28GS Repair: £150-300
- Intec 40GS2 Repair: £120-250
- Intec 50CS Repair: £150-300
- Intec2 25 28XE Repair: £120-250
- Intec2 30SE Repair: £120-250
- Pro Tec 24 Repair: £120-250
- Pro Tec Plus Repair: £120-250
- SY Repair: £120-250
Source
Alpha E03 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