BoilerFaultCodesFerroli F52 Fault Code
The Ferroli F52 fault code means: your boiler has detected a problem with the internal sensor that monitors water temperature or flow, meaning it cannot safely regulate how much it heats the water.. It appears on 4 Ferroli models in our database.
Technical description: Flow sensor – fault sensor damaged
What causes the Ferroli F52 fault?
This fault occurs when the boiler's internal sensor, which monitors the temperature of the water leaving the unit, starts providing inaccurate readings or stops communicating entirely. The most common reason is that the sensor has suffered electrical failure or has become covered in debris, preventing it from safely measuring how hot the water is.
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 F52 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli F52 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