BoilerFaultCodesIntergas F005 Fault Code
The Intergas F005 fault code means: your boiler is struggling to keep a flame lit after it has already started, which prevents it from heating your home properly.. It appears on 5 Intergas models in our database.
Technical description: Flame disappears during operation
What causes the Intergas F005 fault?
This fault occurs when the boiler's control system loses the signal that a flame is present while it should be running. It is often caused by a dirty or worn-out sensor that can no longer 'see' the flame, or an incorrect mix of gas and air preventing a stable burn. In some cases, recirculating exhaust fumes due to a leaky flue seal can also suffocate the flame shortly after it starts.
This fault can appear more frequently during periods of high wind, as strong gusts can sometimes disrupt the flame stability or affect the pressure within the flue system.
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 F005 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas F005 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