1 to 9, h, l, b Low

Boiler Fault Code 1 to 9, h, l, b

Also written as 1TO9HLB — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 1 to 9, h, l, b 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 displaying standard status codes to show it is working normally or warming up, rather than indicating a fault. (As reported on Remeha Quinta 115)

Pick your boiler brand for the 1 to 9, h, l, b fix

Remeha 1 to 9, h, l, b 1 model

Source

Information for the 1 to 9, h, l, b 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