BoilerFaultCodesIntergas F05 Fault Code
The Intergas F05 fault code means: your boiler has stopped working because an internal temperature sensor that monitors your hot water or heating has developed an electrical fault.. It appears on 3 Intergas models in our database.
Technical description: S3 sensor short circuit
What causes the Intergas F05 fault?
This fault occurs when the boiler's control board detects an incorrect electrical signal from the temperature sensor, indicating a short circuit. The most common reason is that the internal components of the sensor have failed due to age, or moisture has compromised the electrical connections. Without an accurate temperature reading, the boiler 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 F05 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas F05 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