How much does it cost to fix boiler error code H4?

Typical repair cost for the boiler H4 fault is £300-700 including labour.

H4 High

Boiler Fault Code H4

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code H4 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 heat pump is shutting down because it has detected a recurring electrical surge in its motor system, preventing it from operating safely. (As reported on Ideal HP290)

Pick your boiler brand for the H4 fix

Ideal H4 1 model

Source

Information for the H4 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 7 July 2026