How much does it cost to fix boiler error code H.02 – .03?

Typical repair cost for the boiler H.02 – .03 fault is £80-160 including labour.

H.02 – .03 High

Boiler Fault Code H.02 – .03

Also written as H0203 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code H.02 – .03 appears across 1 boiler brand and 24 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is temporarily confused by its internal software settings and cannot start up correctly. (As reported on Baxi 200 / 400 Combi)

Pick your boiler brand for the H.02 – .03 fix

Baxi H.02 – .03 24 models

Source

Information for the H.02 – .03 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