BoilerFaultCodes UF High
Boiler Fault Code UF
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code UF appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is currently stuck in a professional service mode used by engineers when they are replacing an internal valve. (As reported on Ideal Logic Code Combi ESP1)
Pick your boiler brand for the UF fix
Source
Information for the UF 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