BoilerFaultCodesAriston E 08 Fault Code
Also written as E08 — same fault.
The Ariston E 08 fault code means: your boiler has detected that the water level inside the heating system is too low to operate safely.. It appears on 2 Ariston models in our database.
Technical description: No water in the primary circuit
DIY fix possible
Locate the filling loop, which is usually a silver braided hose under the boiler connected to two valves.Slowly open the valves to allow mains water into your heating system.Watch the pressure gauge on the front of the boiler until it reaches the green zone, typically between 1.0 and 1.5 bar.Close both valves tightly and restart the boiler.
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Ariston models that show the E 08 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston E 08 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 31 August 2026