BoilerFaultCodesZanussi F3 Fault Code
The Zanussi F3 fault code means: your boiler has detected an issue with the internal fan, which is preventing the system from safely clearing exhaust gases and starting the ignition process.. It appears on 1 Zanussi model in our database.
Technical description: Fan Fault
What causes the Zanussi F3 fault?
This fault occurs when the boiler's control center is unable to communicate with or power the fan that removes exhaust gases. The most common reasons are a complete mechanical failure of the fan motor or a fault in the electronic circuit board that sends the signal to start. Without the fan spinning at the correct speed, the boiler will refuse to ignite for safety reasons.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Zanussi models that show the F3 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Zanussi F3 fault code information on this page is sourced and cross-checked against the official Zanussi service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026