How much does it cost to fix boiler error code H29?

Typical repair cost for the boiler H29 fault is £120-200 including labour.

H29 Low

Boiler Fault Code H29

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code H29 appears across 1 boiler brand and 2 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 communicate with a weather sensor outside your home, so it is temporarily ignoring the outdoor temperature readings to keep your heating running. (As reported on Worcester Bosch Greenstar 12i System)

Pick your boiler brand for the H29 fix

Worcester Bosch H29 2 models

Source

Information for the H29 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