BoilerFaultCodes F.437 High
Boiler Fault Code F.437
Also written as F437 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.437 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has lost the connection to the sensor that monitors the flow of water, meaning it cannot safely heat your home or provide hot water. (As reported on Viessmann Vitodens 100-W WB1A)
Pick your boiler brand for the F.437 fix
Source
Information for the F.437 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