How much does it cost to fix boiler error code H.02.12?

Typical repair cost for the boiler H.02.12 fault is £60-180 including labour.

H.02.12 High

Boiler Fault Code H.02.12

Also written as H0212 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code H.02.12 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has been told to stop running by an external safety device or control, such as a thermostat or a condensation pump, which has detected an issue. (As reported on Baxi 800)

Pick your boiler brand for the H.02.12 fix

Baxi H.02.12 2 models

Source

Information for the H.02.12 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