BoilerFaultCodesIntergas F009 Fault Code
The Intergas F009 fault code means: your boiler's main internal computer has developed a technical hardware fault and is unable to operate the heating or hot water.. It appears on 5 Intergas models in our database.
Technical description: Bunner controller has internal fault
What causes the Intergas F009 fault?
This fault occurs when the main electronic brain of the boiler suffers a critical hardware failure or a memory error. The most common reason is age-related wear on the electrical components within the control board, preventing it from safely managing the ignition sequence. Because the boiler can no longer verify its own safety checks, it shut downs completely to prevent any accidents.
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 F009 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas F009 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