How much does it cost to fix boiler error code Flow Thermistor?

Typical repair cost for the boiler Flow Thermistor fault is £90-160 including labour.

Flow Thermistor High

Boiler Fault Code Flow Thermistor

Also written as FLOWTHERMISTOR — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Flow Thermistor 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 has detected an issue with the sensor that monitors the temperature of the water leaving the unit, meaning it cannot heat your home or water safely. (As reported on Baxi 130 HE (range))

Pick your boiler brand for the Flow Thermistor fix

Baxi Flow Thermistor 3 models

Source

Information for the 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 27 April 2026