BoilerFaultCodesIntergas F001 Fault Code
The Intergas F001 fault code means: your boiler has shut down because the water inside the heating system has become too hot and cannot circulate properly.. It appears on 5 Intergas models in our database.
Technical description: Temperature is too high during central heating demand.
What causes the Intergas F001 fault?
This fault occurs when the water inside the heat exchanger reaches a dangerously high temperature because it cannot move through the system effectively. The most common reasons are a failed circulation pump that is no longer pushing water around or a blockage caused by a build-up of sludge and debris in the pipework.
This issue is more frequent during the first cold snap of autumn when pumps that have been idle all summer often seize up or struggle to move heavy sludge.
DIY fix possible
Check that all radiator valves and internal doors are open to allow water flow.Ensure your system pressure is between 1.0 and 1.5 bar on the digital display.Restart the boiler once it has cooled down to see if the error clears.
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Gas Safe Register →Intergas models that show the F001 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas F001 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