BoilerFaultCodes 126 Medium
Boiler Fault Code 126
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 126 appears across 3 boiler brands 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 is having trouble communicating the correct temperature settings for your hot water, which may cause your hot water supply to behave inconsistently or stop heating up. (As reported on Ideal Logic Air)
Pick your boiler brand for the 126 fix
Source
Information for the 126 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