I have a 3 unit sistem LG MU3M19 (A3UW186FA5) with 2 indoor unit`s conected . Indoor model is MA12AH1( AMNH12GAF11) . The sistem is brand new but was installed 2-3 years ago and never start-ed . I must say i made conection for comunication between indoor and outdoor , conecting the comunication wire to the outdoor . Now the sistem is doing this : when i try to start the units after 30 seconds i have a green light flickering 5 times. A pause and starting again 5 times . I don`t have any manuals on the sistem . Please help me . I still belive is a comunication error but no`t shure .