BoilerFaultCodesFerroli Insufficient pressure Fault Code
Also written as INSUFFICIENTPRESSURE — same fault.
The Ferroli Insufficient pressure 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 3 Ferroli models in our database.
Technical description: Insufficient pressure in central heating system. Indicated by the bottom red light on the left hand side of the facia illuminating (bar symbol).
DIY fix possible
Locate the filling loop (a silver braided hose) underneath the boilerOpen the small valve or tap attached to the hose slowlyWatch the pressure gauge on the front of the boiler until the needle reaches between 1 and 1.5 barClose the valve tightly to stop the flow of water
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ferroli models that show the Insufficient pressure fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli Insufficient pressure 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