ponytail 4

Just had the air conditioning compressor and dryer receiver changed and charged to specs. Just blows cool air through the vents. I did the dyo. with the control panel and the code 43 came up, Air outlet damper position sensor circuit, could that be the problem and where in the system is it located? I know someone in the this forum has super knowledge and will be able to unscramble my problem. Thanks in advance for any info. that can be sent.