F0 High

Heatline F0 Fault Code

The Heatline F0 fault code means: your boiler has stopped working because the water pressure inside the system is too low.. It appears on 1 Heatline model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Low water pressure
Typical repair cost £0-120 (including labour)

DIY fix possible

Locate the flexible filling loop underneath the boiler.Slowly open the small valves on the loop until you hear water entering the system.Watch the pressure gauge and close the valves once the needle reaches between 1.0 and 1.5 bar.

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Heatline models that show the F0 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Heatline F0 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