BoilerFaultCodes F.011 High
Boiler Fault Code F.011
Also written as F011 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.011 appears across 1 boiler brand and 3 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 electrical fault in a sensor that measures the temperature of water returning to the unit, causing it to stop working for safety reasons. (As reported on Vaillant ecoTEC plus)
Pick your boiler brand for the F.011 fix
Source
Information for the F.011 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