BoilerFaultCodesIntergas E1 Fault Code
The Intergas E1 fault code means: your boiler has stopped because the water pressure inside the system has dropped too low.. It appears on 1 Intergas model in our database.
Technical description: Low water pressure / Flow error
DIY fix possible
Locate the filling loop (usually a silver braided hose with one or two valves) connected to the boiler pipework.Slowly open the valves to allow mains water into the boiler until the gauge reads between 1.0 and 1.5 bar.Close the valves firmly and check for any visible leaks around the pipework.
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Intergas models that show the E1 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas E1 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 7 July 2026