BoilerFaultCodesIntergas F06 Fault Code
The Intergas F06 fault code means: your boiler has stopped working because it cannot communicate with the internal sensor that monitors your hot water temperature.. It appears on 3 Intergas models in our database.
Technical description: S3 sensor open circuit
What causes the Intergas F06 fault?
This fault occurs when the boiler's main control board loses its connection to the sensor that measures hot water temperature. The most common reason is that the sensor itself has developed an internal electrical failure or the wiring connecting it to the system has come loose. Because the boiler no longer knows how hot the water is, it shuts down as a safety precaution to prevent overheating.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Intergas models that show the F06 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas F06 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