BoilerFaultCodesHeatline F74 Fault Code
The Heatline F74 fault code means: your boiler's sensor is struggling to read your heating system's pressure, which prevents the unit from starting the heating or hot water safely.. It appears on 8 Heatline models in our database.
Technical description: Heating circuit pressure sensor fault
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Heatline models that show the F74 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Heatline F74 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