BoilerFaultCodes 112 High
Boiler Fault Code 112
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 112 appears across 2 boiler brands and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has stopped working because a sensor that monitors the temperature of the water returning to the unit has failed or is giving an incorrect reading. (As reported on Atag iS System)
Pick your boiler brand for the 112 fix
Source
Information for the 112 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