BoilerFaultCodes 11 High
Boiler Fault Code 11
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 11 appears across 21 boiler brands and 66 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 a problem with one of its internal temperature sensors, which means it cannot safely measure the heat of the water and has stopped working as a precaution. (As reported on Atmos Intercombi HE32)
Pick your boiler brand for the 11 fix
Alpha 11 1 model Atag 11 2 models Atmos 11 3 models Baxi 11 3 models Biasi 11 2 models Chaffoteaux 11 4 models Daikin 11 1 model Dimplex 11 3 models Ferroli 11 2 models Glow-worm 11 7 models Ideal 11 3 models Intergas 11 7 models Johnson Starley 11 1 model Potterton 11 3 models Remeha 11 7 models Saunier Duval 11 5 models Sime 11 2 models Unical 11 2 models Viessmann 11 3 models Vokera 11 4 models Worcester Bosch 11 1 model
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 31 August 2026