BoilerFaultCodesAriston EE0011 Fault Code
The Ariston EE0011 fault code means: your boiler has stopped working because the water pressure inside the heating system has dropped too low.. It appears on 2 Ariston models in our database.
Technical description: Insufficient water pressure
DIY fix possible
Locate the filling loop, which is a silver braided hose or a small lever located underneath the boiler.Slowly open the valves on the filling loop to allow water to enter the system while watching the pressure gauge on the front of the boiler.Wait for the needle to reach the green zone, typically between 1.0 and 1.5 bar, then firmly close the valves.
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Ariston models that show the EE0011 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston EE0011 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026