How much does it cost to fix boiler error code 723?

Typical repair cost for the boiler 723 fault is £120-250 including labour.

723 Medium

Boiler Fault Code 723

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 723 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that the third heating zone is getting too hot, likely due to a circulation problem or a faulty sensor in that specific area of your home. (As reported on Ariston Alteas One)

Pick your boiler brand for the 723 fix

Ariston 723 1 model

Source

Information for the 723 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026