BoilerFaultCodesIntergas F005 Fault Code
The Intergas F005 fault code means: your boiler started to heat up but the flame went out unexpectedly, causing the system to stop working for safety.. It appears on 4 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 successfully lights the burner but then loses the signal that a flame is present, leading to an immediate shutdown. The most common reasons include a buildup of carbon on the detection probe, a blockage in the drainage system that causes water to back up into the heat exchanger, or an incorrect mixture of gas and air.
This fault is more frequent during freezing winter spells, as a frozen external condensate pipe can cause water to back up and extinguish the flame.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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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 7 July 2026