BoilerFaultCodes F.578 Medium
Boiler Fault Code F.578
Also written as F578 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.578 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 temperature sensor for your second heating zone, meaning it can no longer accurately read the heat levels in that part of your home. (As reported on Viessmann Vitodens 100-W WB1A)
Pick your boiler brand for the F.578 fix
Source
Information for the F.578 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