BoilerFaultCodes 79 Emergency
Alpha 79 Fault Code
The Alpha 79 fault code means: your boiler has detected an internal error with the mechanism that controls the fuel supply, meaning it has safely shut itself down to prevent unsafe operation.. It appears on 10 Alpha models in our database.
Technical description: Anomaly on the gas valve control - An anomaly on the gas valve control is detected
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 79 fault code
Click a model for the full fault code list and model-specific repair notes.
- C25 Xtraflame Repair: £150-£300
- E-Tec Plus Repair: £180-350
- E-Tec Plus 24 Repair: £180-350
- E-Tec Plus 28 Repair: £180-350
- E-Tec Plus 33 Repair: £180-350
- H25 Xtraflame Repair: £150-£300
- Intec 28GS Repair: £150-£300
- Intec 50CS Repair: £150-£300
- Intec2 25 28XE Repair: £150-£300
- Intec2 30SE Repair: £150-300
Source
Alpha 79 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