Genuine Daikin 2336673 Low Pressure Sensor is the sensor that reads the low-side refrigerant pressure in the outdoor unit, giving the system the reading it uses to run safely and correctly. When it begins to fail, the outdoor unit may stop and start unexpectedly, lose output, or shut down to protect itself. A genuine sensor reads pressure the way your Daikin expects, keeping that protection accurate — where a non-genuine part can read off and leave the system running wrong.