Ferroli Low system water pressure Fault Code
Also written as LOWSYSTEMWATERPRESSURE — same fault.
The Ferroli Low system water pressure fault code means: your boiler has stopped working because the amount of water inside your heating system has dropped below the required level.. It appears on 1 Ferroli model in our database.
Technical description: System empty
DIY fix possible
Locate the external filling loop, which is a silver braided hose with one or two small valves connecting your cold water main to your heating pipes.Open the valve(s) slowly and watch the pressure gauge on the front of the boiler until the needle reaches the green zone, typically between 1.0 and 1.5 bar.Close the valve(s) tightly to prevent over-pressurizing the system.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ferroli models that show the Low system water pressure fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli Low system water 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