BoilerFaultCodesHeatline F.28 Fault Code
Also written as F28 — same fault.
The Heatline F.28 fault code means: your boiler is failing to light the gas flame despite several attempts, meaning it cannot provide heating or hot water.. It appears on 3 Heatline models in our database.
Technical description: After three successive failed ignition attempts, the system switches to fault mode.
DIY fix possible
Check if other gas appliances in your home, such as a hob, are working to ensure gas supply is active.Verify that your gas meter has credit and that the emergency control valve is open.Press the Reset button (indicated by a flame with a line through it) for 3 seconds to restart the ignition process.
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Heatline models that show the F.28 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Heatline F.28 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026