BoilerFaultCodes F1 263 High
Boiler Fault Code F1 263
Also written as F1263 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F1 263 appears across 1 boiler brand and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected a critical failure in its internal electronic brain, meaning it has safely shut itself down and cannot operate until the hardware is repaired. (As reported on Worcester Bosch Greenstar i)
Pick your boiler brand for the F1 263 fix
Source
Information for the F1 263 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