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

Typical repair cost for the boiler H1 fault is £0-120 including labour.

H1 High

Boiler Fault Code H1

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code H1 appears across 2 boiler brands and 4 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 low water pressure in the system, which is preventing it from heating up. (As reported on Ideal Esprit HE)

Pick your boiler brand for the H1 fix

Ideal H1 2 models Worcester Bosch H1 2 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 31 August 2026