How much does it cost to fix boiler error code 712?

Typical repair cost for the boiler 712 fault is £110-190 including labour.

712 Medium

Boiler Fault Code 712

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 712 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 is struggling to monitor the temperature of the water returning from the second heating zone, which may prevent some of your radiators from warming up correctly. (As reported on Ariston Alteas One)

Pick your boiler brand for the 712 fix

Ariston 712 1 model

Source

Information for the 712 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