BoilerFaultCodes No Water Flow High
Boiler Fault Code No Water Flow
Also written as NOWATERFLOW — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code No Water Flow appears across 2 boiler brands and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has stopped working because the water pressure is too low or water isn't moving through the system correctly. (As reported on Ideal Logic Max Heat 2)
Pick your boiler brand for the No Water Flow fix
Source
Information for the No Water Flow 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