BoilerFaultCodesFerroli F41 Fault Code
The Ferroli F41 fault code means: your boiler has switched itself off because the water inside it is heating up much faster than it is moving away, preventing it from working as intended.. It appears on 6 Ferroli models in our database.
Technical description: System out of operation (in case of a temperature gradient higher than the reference value). Make sure that there is circulation in the heat exchanger; check the open position of the valves, check the circulating pump operation). In such a case, the fault can be automatically remedied after the temperature gradient become ≤5°C.
DIY fix possible
Check that all your radiator valves are fully openEnsure your central heating system is pressurized to the correct level (usually 1-1.5 bar)Turn the boiler off and back on again after waiting 10 minutes for the internal temperature to lower
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Ferroli models that show the F41 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli F41 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.
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Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026