BoilerFaultCodesHeatline F1 Fault Code
The Heatline F1 fault code means: your boiler has tried to light several times but has been unable to sustain a flame, meaning you will have no heating or hot water until it is reset.. It appears on 12 Heatline models in our database.
Technical description: Ignition Failure / Ionization Flame Failure
DIY fix possible
Check if your gas meter has credit or other gas appliances are workingEnsure the gas isolation valve under the boiler is fully openPress and hold the 'Reset' button (the one with the flame symbol) for 2-3 seconds
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A cover plan would handle faults like F1: no call-out fees, no surprise bills.
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Heatline models that show the F1 fault code
Click a model for the full fault code list and model-specific repair notes.
- Capriz 25 System Repair: £120-250
- Capriz 25/28 Repair: £120-350
- Capriz 28 Repair: £120-250
- Capriz Plus Repair: £120-250
- CaprizPlus 28 Repair: £120-250
- Sargon Repair: £120-250
- Sargon 24 Repair: £120-250
- Sargon 30 Repair: £120-250
- Solaris Repair: £120-250
- Vizo 24 Repair: £100-£280
- Vizo Plus Repair: £90-180
- Vizo Plus 24 Repair: £120-250
Source
Heatline F1 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.
- Heatline Capriz 25 System manual (PDF)
- Heatline Capriz 28 manual (PDF)
- Heatline CaprizPlus 28 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026