722 Medium

Ariston 722 Fault Code

The Ariston 722 fault code means: your boiler has detected that the secondary heating circuit is getting too hot, likely due to a circulation or sensor issue.. It appears on 1 Ariston model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Overheating in zone 2
Typical repair cost £120-280 (including labour)

DIY fix possible

Check that all radiator valves in the secondary zone (e.g. upstairs or underfloor heating) are fully open.Ensure there is no trapped air in the system by bleeding the radiators.Restart the boiler to see if the fault clears.

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Ariston models that show the 722 fault code

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

Source

Ariston 722 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