BoilerFaultCodesKeston E01 Fault Code
The Keston E01 fault code means: your boiler has tried to light several times without success, meaning your heating and hot water will not work until the gas supply is restored or the ignition is fixed.. It appears on 4 Keston models in our database.
Technical description: Ignition failure – the boiler has attempted to light 5 times and not succeeded – check the gas supply is on
DIY fix possible
Check that your gas emergency control valve is in the 'on' positionCheck if other gas appliances (like a hob) are working to confirm gas flow to the propertyIf you have a prepaid gas meter, ensure it has sufficient creditGently press the reset button on the control panel to see if the boiler restarts
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Keston models that show the E01 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Keston E01 fault code information on this page is sourced and cross-checked against the official Keston service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026