BoilerFaultCodes A02.55 Medium
Boiler Fault Code A02.55
Also written as A0255 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code A02.55 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's computer memory has lost or cannot recognise its unique identification number, which prevents it from starting up correctly. (As reported on Remeha Quinta Ace 30)
Pick your boiler brand for the A02.55 fix
Source
Information for the A02.55 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