Genuine Daikin 032973J Air Thermistor is the sensor that reads air temperature, giving the unit the reading it uses to run at the right level. When it starts to fail, the unit may stop holding the set temperature, run warmer or cooler than needed, or cycle on and off at odd times. A genuine sensor reads temperature the way your Daikin expects, keeping it accurate — where a non-genuine part can read off and leave it running incorrectly.