BoilerFaultCodes F.373 High
Boiler Fault Code F.373
Also written as F373 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.373 appears across 1 boiler brand and 4 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 an internal issue and has safely shut down the burner to prevent damage, meaning you currently have no heating or hot water. (As reported on Viessmann Vitodens 200-W B2HF System)
Pick your boiler brand for the F.373 fix
Source
Information for the F.373 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