How much does it cost to fix boiler error code H1?

Typical repair cost for the boiler H1 fault is £90-160 including labour.

H1 High

Boiler Fault Code H1

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code H1 appears across 2 boiler brands and 10 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because it cannot properly measure the temperature of the water leaving the unit. (As reported on Ideal Mexico HE)

Pick your boiler brand for the H1 fix

Ideal H1 5 models Worcester Bosch H1 5 models

Source

Information for the H1 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