BoilerFaultCodes F.085 High
Boiler Fault Code F.085
Also written as F085 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.085 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's temperature sensors have been fitted incorrectly or have become misaligned, preventing the system from accurately reading the water temperature. (As reported on Vaillant ecoTEC plus)
Pick your boiler brand for the F.085 fix
Source
Information for the F.085 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 31 August 2026