How much does it cost to fix boiler error code H.02.04?

Typical repair cost for the boiler H.02.04 fault is £280-500 including labour.

H.02.04 High

Boiler Fault Code H.02.04

Also written as H0204 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code H.02.04 appears across 1 boiler brand and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's main control board is having trouble reading its own saved internal settings, which is preventing the system from starting up. (As reported on Baxi 800)

Pick your boiler brand for the H.02.04 fix

Baxi H.02.04 8 models

Source

Information for the H.02.04 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