BoilerFaultCodes F.431 Low
Boiler Fault Code F.431
Also written as F431 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.431 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 is working fine, but it is failing to communicate with your smart home or external heating control system. (As reported on Viessmann Vitodens 222-F B2TF)
Pick your boiler brand for the F.431 fix
Source
Information for the F.431 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