BoilerFaultCodes NO DHW BUT CH OK High
Boiler Fault Code NO DHW BUT CH OK
Also written as NODHWBUTCHOK — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code NO DHW BUT CH OK 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 heating your home correctly, but hot water is not being produced, likely due to a faulty diverter valve or sensor issue. (As reported on Ideal Vogue System)
Pick your boiler brand for the NO DHW BUT CH OK fix
Source
Information for the NO DHW BUT CH OK 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