Amigo Dorado tao, you must keep searching by pressing the SEL key until it beeps and then press the ENTER key to store the code, and once the code is stored you must test all the functions with the remote control to see if the air He responds to you and if not, then you should continue looking for another code. in case you do not get the code, then I recommend this Remote control the KT1000 that is of the same brand, but it has 1000 codes and the one you have only has 500 codes, generally the splits airs use codes higher than 500 .