BoilerFaultCodesAriston Overheating Fault Code
Also written as OVERHEATING — same fault.
The Ariston Overheating fault code means: your boiler has shut down because it has detected that the water inside the system has become dangerously hot.. It appears on 1 Ariston model in our database.
Technical description: The safety limit for the water temperature in the boiler's exchanger is exceeded; indicated by the illumination of the red L.E.D. 'H'
DIY fix possible
Locate the reset button (usually marked 'R') on the control panel and press it.Ensure all radiator valves are fully open to allow water to flow freely.Check that your system pressure is between 1.0 and 1.5 bar on the gauge and top up if necessary.
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Ariston models that show the Overheating fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston Overheating 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