BoilerFaultCodes A00.34 Low
Boiler Fault Code A00.34
Also written as A0034 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code A00.34 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 lost the connection to the external sensor that tells it how cold it is outside, so it is currently operating in a default mode. (As reported on Remeha Quinta Ace 30)
Pick your boiler brand for the A00.34 fix
Source
Information for the A00.34 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 7 July 2026