How much does it cost to fix boiler error code H.01 – .00?

Typical repair cost for the boiler H.01 – .00 fault is £180-350 including labour.

H.01 – .00 High

Boiler Fault Code H.01 – .00

Also written as H0100 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code H.01 – .00 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 has lost its internal connection to the main gas control unit, meaning it cannot safely manage the fuel it needs to fire up. (As reported on Baxi 200 / 400 Combi)

Pick your boiler brand for the H.01 – .00 fix

Baxi H.01 – .00 24 models

Source

Information for the H.01 – .00 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