BoilerFaultCodesHeatline F28 Fault Code
The Heatline F28 fault code means: your boiler has tried to light several times but cannot establish a steady flame, which means your heating and hot water will not work.. It appears on 8 Heatline models in our database.
Technical description: Burner fails to ignite, initially, this may be due to air in the gas supply line.
DIY fix possible
Check that your gas meter has credit and the emergency control valve is turned on.Verify if other gas appliances, like a cooker, are working correctly to rule out a supply issue.Press the Reset button (indicated by a flame with a cross through it) and hold for 1-3 seconds.
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Heatline models that show the F28 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Heatline F28 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.
- Heatline CaprizPlus 28 manual (PDF)
- Heatline CaprizPlus 24a manual (PDF)
- Heatline Compact 24 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026