BoilerFaultCodesFerroli LED3 Fault Code
The Ferroli LED3 fault code means: your boiler is currently reading a request to provide hot water or heating, which is a normal operational signal and not a fault unless the boiler fails to fire up.. It appears on 2 Ferroli models in our database.
Technical description: Demand for heat from D.H.W. or C.H. (Connection 68 on P.C.B. switched on)
DIY fix possible
Check that your room thermostat is turned up to trigger a heating demandEnsure your programmer or timer is set to an 'On' periodOpen a hot water tap fully to see if the boiler responds to the demand
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Ferroli models that show the LED3 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli LED3 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 7 July 2026