BoilerFaultCodesFerroli LED 5 (Flashing light) Fault Code
Also written as LED5FLASHINGLIGHT — same fault.
The Ferroli LED 5 (Flashing light) fault code means: your boiler has stopped working because the water pressure inside your heating system has dropped too low to operate safely.. It appears on 6 Ferroli models in our database.
Technical description: Insufficient pressure in central heating system
DIY fix possible
Locate the external filling loop, which is a silver braided flexible hose connected to two valves under the boiler.Open both taps on the filling loop slowly to let water into the system until the pressure gauge on the front reads between 1 and 1.5 bar.Close both taps tightly and check for leaks, then reset the boiler.
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Ferroli models that show the LED 5 (Flashing light) fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli LED 5 (Flashing light) 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