BoilerFaultCodes CH Low
Boiler Fault Code CH
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code CH appears across 1 boiler brand and 2 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 in the process of sending hot water to your radiators, which is normal operation rather than a fault. (As reported on Ideal Isar HE)
Pick your boiler brand for the CH fix
Source
Information for the CH 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