BoilerFaultCodes F99 High
Boiler Fault Code F99
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F99 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's electronic command center is currently unable to communicate with the display, meaning the system has safely shut down until the connection is restored. (As reported on Ferroli Force W)
Pick your boiler brand for the F99 fix
Source
Information for the F99 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