BoilerFaultCodesFerroli F05 Fault Code
The Ferroli F05 fault code means: your boiler has detected that the internal fan responsible for safely exhausting fumes is not spinning at the correct speed, so it has stopped working to prevent a safety issue.. It appears on 6 Ferroli models in our database.
Technical description: Fan speed incorrect
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Ferroli models that show the F05 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli F05 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 27 April 2026