BoilerFaultCodes Bat High
Boiler Fault Code Bat
Also written as BAT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Bat appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is having trouble communicating with an external safety device, such as a carbon monoxide alarm or a specialized shut-off sensor, causing it to stop operating as a precaution. (As reported on Main Insul 7)
Pick your boiler brand for the Bat fix
Source
Information for the Bat 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