Boiler Fault Code No display

Also written as NODISPLAY — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code No display appears across 4 boiler brands and 20 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is not reacting when you turn on the hot tap, leaving you with cold water and a blank display because it cannot sense that water is flowing. (As reported on Halstead Dimplex Combi)