BoilerFaultCodes Hot water demand indicator Low
Boiler Fault Code Hot water demand indicator
Also written as HOTWATERDEMANDINDICATOR — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Hot water demand indicator 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 correctly recognizing that you have turned on a hot tap and is working exactly as it should. (As reported on Vaillant Turbomax VU 182)
Pick your boiler brand for the Hot water demand indicator fix
Source
Information for the Hot water demand indicator 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