BoilerFaultCodesHeatline E01 Fault Code
The Heatline E01 fault code means: your boiler has tried to light itself but failed, often because gas isn't flowing correctly or the ignition spark isn't working.. It appears on 2 Heatline models in our database.
Technical description: Ignition failure or spurious flame signal
DIY fix possible
Check that your gas pre-payment meter (if you have one) has credit.Ensure your gas stopcock or isolation valves are fully open.Check if other gas appliances, like a hob, are working to confirm gas supply.Press the Reset button once to see if the boiler restarts.
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Heatline models that show the E01 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Heatline E01 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026