BoilerFaultCodesAlpha E01 Fault Code
The Alpha E01 fault code means: your boiler has failed to ignite, which means it cannot provide any heating or hot water until the flame is established.. It appears on 2 Alpha models in our database.
Technical description: 5645050 725
DIY fix possible
Check that your gas supply is turned on at the meterPress and hold the reset button for several secondsConfirm that other gas appliances in your home, like a hob, are working correctly
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Alpha models that show the E01 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Alpha E01 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