BoilerFaultCodes No DHW But CH Works OK Medium
Boiler Fault Code No DHW But CH Works OK
Also written as NODHWBUTCHWORKSOK — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code No DHW But CH Works OK appears across 1 boiler brand 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 working to heat your radiators, but it is failing to detect when you turn on a hot tap or is unable to switch the water flow to your taps. (As reported on Ideal Logic Code Combi ESP1)
Pick your boiler brand for the No DHW But CH Works OK fix
Source
Information for the No DHW But CH Works 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 27 April 2026