I had a licensed electrician install a system and he let me with two remotes. I purchased a third from Home Depot and am having a problem programming it. The setup does not include a wall mounted switch but a box in the attic. I downloaded the programming instructions and press the top and bottom buttons, at which time it goes into programming mode, but that's as far as I get. I'm beginning to think that the hub in the attic needs to be placed into "pairing" mode in order to program the new remote. Am I correct?