How much does it cost to fix boiler error code THERMISTOR?

Typical repair cost for the boiler THERMISTOR fault is £100-180 including labour.

THERMISTOR High

Boiler Fault Code THERMISTOR

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code THERMISTOR appears across 1 boiler brand and 2 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 a faulty temperature sensor which means it can no longer accurately monitor how hot the water is getting. (As reported on Potterton Promax 15/2 HE Plus)

Pick your boiler brand for the THERMISTOR fix

Potterton THERMISTOR 2 models

Source

Information for the 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