BoilerFaultCodesMain E1 Fault Code
The Main E1 fault code means: your boiler has failed to light or cannot detect that the flame is burning, so it has shut down as a safety precaution.. It appears on 2 Main models in our database.
Technical description: Ionization fault (no flame signal)
DIY fix possible
Check if other gas appliances in your home, like a hob, are working to ensure gas is being supplied.If you have a prepaid gas meter, check that it has sufficient credit.Press and hold the reset button for several seconds to try and restart the boiler.
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Main models that show the E1 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Main E1 fault code information on this page is sourced and cross-checked against the official Main service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026