BoilerFaultCodesVaillant F.024 Fault Code
Also written as F024 — same fault.
The Vaillant F.024 fault code means: your boiler has detected trapped air bubbles that are preventing water from flowing properly and heating up, causing the system to shut down for safety.. It appears on 3 Vaillant models in our database.
Technical description: Air in the product. The temperature increases too quickly.
DIY fix possible
Check your boiler pressure gauge and ensure it is between 1.0 and 1.5 barTop up the pressure using the filling loop if it is below 1.0 barBleed your radiators starting from the ground floor and working your way up to release any trapped airReset the boiler using the flame-through-a-cross button on the front panel
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Vaillant models that show the F.024 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vaillant F.024 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026