BoilerFaultCodesIntergas E01 Fault Code
The Intergas E01 fault code means: your boiler is trying to light but cannot spark or maintain a flame, meaning you have no heating or hot water.. It appears on 6 Intergas models in our database.
Technical description: Ignition failure
What causes the Intergas E01 fault?
This fault occurs when the boiler's internal computer tries to start the burner multiple times but cannot detect a successful flame. The most common reason is a problem with the gas supply or a worn-out ignition spark, but it can also be triggered by a build-up of debris on the internal sensors that monitor the fire.
This fault is more common during extreme cold spells, as the external gas regulator or condensate pipe can freeze, preventing the boiler from lighting safely.
DIY fix possible
Check that your gas emergency control valve is in the 'on' position.Verify if other gas appliances, such as a hob, are working to confirm gas supply.If you have a pre-payment meter, ensure you have sufficient credit.Press the 'Reset' button on the boiler control panel for 2 seconds.
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Gas Safe Register →Intergas models that show the E01 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas E01 fault code information on this page is sourced and cross-checked against the official Intergas service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026