BoilerFaultCodes F2 1.25AT High
Boiler Fault Code F2 1.25AT
Also written as F2125AT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F2 1.25AT appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has stopped working because an internal safety fuse has blown, likely due to an electrical surge or a faulty component inside the unit. (As reported on Worcester Bosch 24 RSF)
Pick your boiler brand for the F2 1.25AT fix
Source
Information for the F2 1.25AT 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