BoilerFaultCodesAriston 105 Fault Code
The Ariston 105 fault code means: your boiler has detected that water is not circulating properly, causing it to overheat and shut down for safety.. It appears on 1 Ariston model in our database.
Technical description: All Boilers
DIY fix possible
Check that your boiler pressure is between 1 and 1.5 bar on the gauge.Ensure all radiator valves and isolation valves under the boiler are fully open.Try bleeding your radiators to remove any trapped air pockets.Restart the boiler using the reset button.
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Gas Safe Register →Ariston models that show the 105 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston 105 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