How much does it cost to fix boiler error code 729?

Typical repair cost for the boiler 729 fault is £80-150 including labour.

729 High

Boiler Fault Code 729

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 729 appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is displaying an internal identification code rather than an active fault, indicating the system's computer may need to be reset or reconfigured by a professional. (As reported on Grant Vortex Eco)

Pick your boiler brand for the 729 fix

Grant 729 5 models

Source

Information for the 729 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