BoilerFaultCodes THERMISTOR OPEN CIRCUIT High
Boiler Fault Code THERMISTOR OPEN CIRCUIT
Also written as THERMISTOROPENCIRCUIT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code THERMISTOR OPEN CIRCUIT 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 its connection to one of its temperature sensors and has shut down to prevent the system from overheating. (As reported on Potterton Performa System HE)
Pick your boiler brand for the THERMISTOR OPEN CIRCUIT fix
Source
Information for the THERMISTOR OPEN CIRCUIT 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