101 High

Ariston 101 Fault Code

The Ariston 101 fault code means: your boiler has stopped working because it has detected an overheating issue within the main heat exchanger.. It appears on 1 Ariston model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: All Boilers
Typical repair cost £120-350 (including labour)

DIY fix possible

Turn the boiler off and allow it to cool down for 20 minutes.Ensure all radiator valves are fully open and there are no obstructions to water flow.Press the 'Reset' button on the front control panel to restart the system.

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Ariston models that show the 101 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ariston 101 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