Pentair Heater Thermistor Service Kit | 42001-0053S Jack's Magic it supports changing operating modes

it supports changing operating modes by directing flow toward spa jets or pool returns as needed

manufactured to exact factory specifications for airflow performance

Napoleon BHD4PN

Intended for OEM replacement use only

Pentair Heater Thermistor Service Kit | 42001-0053S Jack's Magic it supports changing operating modesWhat This Part Is Used For Pentair 42001 0053S Heater Thermistor Service Kit is a replacement temperature sensor kit for compatible Pentair heaters. It monitors water temperature and communicates with the control system. Why This Part Matters A faulty thermistor can cause incorrect temperature readings or heater shutdown. Replacing the kit restores accurate sensing and stable heater control. Reliable temperature feedback supports consistent heating