A. Low

Boiler Fault Code A.

Also written as A — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code A. appears across 2 boiler brands and 3 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 a status code indicating how it has been configured to manage your heating and hot water settings, but it is not currently indicating a system failure. (As reported on Remeha Quinta 30)

Pick your boiler brand for the A. fix

Ideal A. 1 model Remeha A. 2 models

Source

Information for the A. 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