BoilerFaultCodesFerroli A10 Fault Code
The Ferroli A10 fault code means: your boiler's internal sensor has stopped correctly monitoring the water temperature as it leaves the unit, preventing it from heating up properly.. It appears on 3 Ferroli models in our database.
Technical description: Flow sensor error
What causes the Ferroli A10 fault?
This fault occurs when the boiler's internal thermometer, which measures the water temperature as it leaves the unit, sends an incorrect or missing signal to the control board. The most common reason is that the sensor has physically failed due to age or wear, though loose or damaged electrical wiring can also prevent the sensor from communicating correctly.
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 A10 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli A10 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