bXX High

Boiler Fault Code bXX

Also written as BXX — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code bXX appears across 3 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has temporarily stopped working because it has detected a specific operating condition that requires it to pause for safety or system protection. (As reported on Remeha Quinta 115)

Pick your boiler brand for the bXX fix

Ideal bXX 1 model Keston bXX 1 model Remeha bXX 3 models

Source

Information for the bXX 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