BoilerFaultCodesFerroli LED5 flashing Fault Code
Also written as LED5FLASHING — same fault.
The Ferroli LED5 flashing fault code means: your boiler has switched itself off because the water pressure in your heating system has dropped too low to operate safely.. It appears on 5 Ferroli models in our database.
Technical description: Insufficient pressure in central heating system (less than 1 bar)
DIY fix possible
Locate the filling loop (usually a silver flexible hose) underneath or near the boiler.Open the filling loop valves slowly until you hear water flowing and watch the pressure gauge.Close both valves tightly once the pressure gauge reaches between 1 and 1.5 bar.
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Gas Safe Register →Ferroli models that show the LED5 flashing fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli LED5 flashing 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