BoilerFaultCodes bL High
Boiler Fault Code bL
Also written as BL — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code bL 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 has detected that the water pressure is too low for it to operate safely and effectively. (As reported on Atag E Range)
Pick your boiler brand for the bL fix
Source
Information for the bL 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