BoilerFaultCodesAriston 1 0 8 Fault Code
Also written as 108 — same fault.
The Ariston 1 0 8 fault code means: your boiler has detected that there is not enough water inside the heating system to operate safely.. It appears on 1 Ariston model in our database.
Technical description: Lack of water (filling required)
DIY fix possible
Locate the filling loop, which is a flexible silver hose connecting two pipes under the boilerOpen the valves at both ends of the hose to allow water into the systemMonitor the pressure gauge on the front of the boiler until it reaches 1.5 bar, then securely close both valves
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Gas Safe Register →Ariston models that show the 1 0 8 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston 1 0 8 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 27 April 2026