BoilerFaultCodes F.763 Emergency
Boiler Fault Code F.763
Also written as F763 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.763 appears across 1 boiler brand and 1 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 that the incoming gas supply pressure is higher than it is designed to handle, forcing it to shut down for safety. (As reported on Viessmann Vitodens 222-F B2TF)
Pick your boiler brand for the F.763 fix
Source
Information for the F.763 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