BoilerFaultCodes i11 Low
Boiler Fault Code i11
Also written as I11 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code i11 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning This code is simply an information display, not a fault, showing you the current temperature of the hot water flowing through your system. (As reported on Worcester Bosch Greenstar Heatslave II)
Pick your boiler brand for the i11 fix
Source
Information for the i11 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