BoilerFaultCodesFerroli A14 Fault Code
The Ferroli A14 fault code means: your boiler has shut down because it has detected a problem with how the exhaust fumes are being cleared from the property.. It appears on 6 Ferroli models in our database.
Technical description: Flue extraction duct safety device intervention
What causes the Ferroli A14 fault?
This fault occurs when the boiler's safety sensors detect that exhaust fumes are not being safely cleared through the flue pipe to the outside. The most common reasons are a blockage in the chimney or a mechanical failure in the fan that pushes the gases away. Because these fumes can be dangerous, the boiler shuts down immediately as a protective measure.
This fault is more common during periods of high winds, which can create back-pressure in the flue and trigger the safety sensor.
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 A14 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli A14 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