BoilerFaultCodes H00.81 Medium
Boiler Fault Code H00.81
Also written as H0081 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code H00.81 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 its connection to its external room temperature sensor, meaning it does not know the room temperature and cannot heat your home appropriately. (As reported on Remeha Quinta Ace 30)
Pick your boiler brand for the H00.81 fix
Source
Information for the H00.81 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