BoilerFaultCodesAriston E 02 Fault Code
Also written as E02 — same fault.
The Ariston E 02 fault code means: your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.. It appears on 2 Ariston models in our database.
Technical description: Insufficient water pressure
DIY fix possible
Locate the filling loop (usually a silver flexible hose) underneath the boiler.Slowly open the small tap or taps on the filling loop until you hear water moving.Watch the pressure gauge until it reaches between 1.0 and 1.5 bar, then turn the taps off tightly.
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Ariston models that show the E 02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston E 02 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