BoilerFaultCodes F.581 Low
Boiler Fault Code F.581
Also written as F581 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.581 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 signal from a temperature sensor used to regulate a specific heating zone, meaning it is currently heating your home based on pre-set timing rather than room temperature. (As reported on Viessmann Vitodens 222-F B2TF)
Pick your boiler brand for the F.581 fix
Source
Information for the F.581 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