BoilerFaultCodes 11 High
Boiler Fault Code 11
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 11 appears across 22 boiler brands and 74 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is currently set to provide hot water but is failing to communicate correctly with your heating controls or hot water cylinder, meaning the system cannot complete the request to heat your water. (As reported on Baxi Suprima 60)
Pick your boiler brand for the 11 fix
Alpha 11 2 models Atag 11 3 models Atmos 11 4 models Baxi 11 6 models Biasi 11 2 models Chaffoteaux 11 3 models Daikin 11 3 models Dimplex 11 2 models Ferroli 11 2 models Gledhill 11 1 model Glow-worm 11 7 models Halstead 11 2 models Ideal 11 3 models Intergas 11 11 models Johnson Starley 11 1 model Potterton 11 2 models Remeha 11 4 models Saunier Duval 11 7 models Sime 11 1 model Unical 11 2 models Vaillant 11 1 model Vokera 11 5 models
Source
Information for the 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 7 July 2026