BoilerFaultCodes 115 High
Boiler Fault Code 115
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 115 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 identified an internal configuration mismatch, as the internal chip installed is designed for a different type of heating system than the one you are currently using. (As reported on Worcester Bosch Greenstar 12i System)
Pick your boiler brand for the 115 fix
Source
Information for the 115 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