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

Typical repair cost for the boiler Cylinder Thermistor Fault fault is £120-200 including labour.

Cylinder Thermistor Fault Medium

Boiler Fault Code Cylinder Thermistor Fault

Also written as CYLINDERTHERMISTORFAULT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Cylinder Thermistor Fault 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 lost the signal from the sensor that monitors the temperature of your hot water cylinder, meaning it does not know when your water is hot enough. (As reported on Keston Heat 45)

Pick your boiler brand for the Cylinder Thermistor Fault fix

Keston Cylinder Thermistor Fault 1 model

Source

Information for the Cylinder Thermistor Fault 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