BoilerFaultCodesFerroli Low water pressure light ON Fault Code
Also written as LOWWATERPRESSURELIGHTON — same fault.
The Ferroli Low water pressure light ON fault code means: your boiler has stopped working because the water pressure inside the system has dropped too low, which is causing it to lock itself to prevent damage.. It appears on 4 Ferroli models in our database.
Technical description: Water pressure below 1 bar or faulty low water pressure switch
DIY fix possible
Locate the filling loop (a silver flexi-hose) underneath your boiler.Open the valves attached to the loop until you hear water flowing.Watch the pressure gauge on the front of the boiler until the needle reaches between 1 and 1.5 bar.Firmly close the valves to stop the flow.
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Ferroli models that show the Low water pressure light ON fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli Low water pressure light ON 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