BoilerFaultCodes Off / Off High
Boiler Fault Code Off / Off
Also written as OFFOFF — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Off / Off appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has completely lost power and its display screen is blank, meaning it cannot operate or heat your home. (As reported on Worcester Bosch 28i Junior)
Pick your boiler brand for the Off / Off fix
Source
Information for the Off / Off 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