BoilerFaultCodes No Water Flow Thermistor High
Boiler Fault Code No Water Flow Thermistor
Also written as NOWATERFLOWTHERMISTOR — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code No Water Flow Thermistor appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected that water isn't moving through the system properly or a temperature sensor has failed, preventing it from heating your home safely. (As reported on Ideal Logic Code Combi)
Pick your boiler brand for the No Water Flow Thermistor fix
Source
Information for the No Water Flow Thermistor 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