BoilerFaultCodes U 00 High
Boiler Fault Code U 00
Also written as U00 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code U 00 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 main computer control panel is reporting a general failure, meaning it cannot communicate correctly to start the heating process. (As reported on Vokera Condexa Pro)
Pick your boiler brand for the U 00 fix
Source
Information for the U 00 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