BoilerFaultCodesAlpha 47 Fault Code
The Alpha 47 fault code means: your boiler is still working but cannot reach its full power, meaning your radiators might not get as hot as they should.. It appears on 21 Alpha models in our database.
Technical description: Reduced burner output
What causes the Alpha 47 fault?
This fault occurs when the boiler's control system detects that the burner cannot maintain its regular intensity, forcing it to operate at a lower power level. The most common reason is that the boiler is struggling to accurately monitor or control the gas flow and flame strength required for full heat. While the boiler stays on, it cannot generate enough energy to satisfy high demands for heating or hot water.
This issue is often more noticeable during winter when the boiler is expected to work at maximum capacity to heat a cold home.
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 →Avoid the next call-out bill
A cover plan would handle faults like 47: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Alpha models that show the 47 fault code
Click a model for the full fault code list and model-specific repair notes.
- E-Tec 28 Repair: £150-300
- E-Tec 33 Repair: £150-300
- E-Tec NX Repair: £150-300
- E-Tec NXS Repair: £120-250
- E-Tec Plus Repair: £150-300
- E-Tec Plus 10 / 18 Repair: £120-300
- E-Tec Plus 28 Repair: £150-300
- E-Tec Plus 33 Repair: £150-300
- E-Tec Plus NX Repair: £120-250
- E-Tec Regular Repair: £100-£250
- E-Tec S Repair: £120-250
- Eco Repair: £150-300
- Eco 11 13 Repair: £120-280
- Evoke Repair: £120-250
- Evoke 10 / 18 Repair: £120-£350
- Evoke NX Repair: £120-250
- Intec 40GS2 Repair: £150-300
- Intec 50CS Repair: £150-300
- Intec S Repair: £120-250
- Intec2 25 28XE Repair: £150-300
- Intec2 30SE Repair: £150-300
Source
Alpha 47 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