BoilerFaultCodes Fault Condition 11 Low
Boiler Fault Code Fault Condition 11
Also written as FAULTCONDITION11 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Fault Condition 11 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 is displaying a status that typically indicates the appliance is in a standard standby or operating mode rather than a fault, meaning it is working exactly as it should. (As reported on Worcester Bosch Greenstar 25i (ZWB 7-25))
Pick your boiler brand for the Fault Condition 11 fix
Source
Information for the Fault Condition 11 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 27 April 2026