BoilerFaultCodesFerroli F 0 5 Fault Code
Also written as F05 — same fault.
The Ferroli F 0 5 fault code means: your boiler has stopped working because the water pressure inside the heating system has dropped too low.. It appears on 1 Ferroli model in our database.
Technical description: Insufficient water system pressure
DIY fix possible
Locate the external filling loop, usually a small silver braided hose with one or two valves underneath the boiler.Slowly open the valve(s) to allow water to enter the system while watching the pressure gauge on the front of the boiler.When the needle is between 1 and 1.5 bar, close the valve(s) tightly to stop the flow.
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Ferroli models that show the F 0 5 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli F 0 5 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026