Specifically designed for Hayward FDXLTER1930 Thermistor in Universal H-Series Low Nox Pool Heater Models. FDXLTER1930 Thermistor Features. 2-Wire Thermistor for Hayward Heaters. After you replace the temperature sensor with a new one, if the temperature reading is not accurate, check the resistance value at the given temperature provided in the Hayward heater user manual, if it is within 10% of the value shown, it is probably not a faulty temperature sensor.
eBay