Thanks for your reply. Two things I left out. I have two of the same keypads. Both have brand new batteries and both are reacting the exact same way. It is for this reason that I feel comfortable ruling out the corrosion as a culprit. The keypads both light and respond to keypad entry. The handheld remotes are programmed in a completely different manner, so the fact that they program shouldn't have anything to do with the keypad programming. I'm just looking for something that I haven't already tried.
According to the real estate agent, they did work on their walkthrough. I actually have the paper work from six years ago where the installation was done by the contractor (who is now out of business) when the garage was built and itemizes the two keypads, so compatibility is also one of those things that I have to rule out. There were about four different methods online about how to program these things and I tried them all. I'm just wondering if there are a couple more that I don't know about.
Well I would verify that they are the correct ones first of all. If you provide me with the model number off the motor unit, I can check that for you. The only method to program them is the instructions that are provided for those keyless pads. I know you have probably seen them already, but I've attached it below. Verify that you are programming with two people. You cannot hold all the buttons alone.The only other thing it could be, if they are not defective or the wrong ones, is the distance to the motor unit/ antenna. Verify that they are installed within view of the opener and verify that the antenna on the motor unit is hanging straight down.
Yep, those are the instructions I used as I also had a copy that I got off of the internet. I actually removed both units from their mounted position and was able to hold all three buttons myself inside the garage. There is something I'm not doing with an already programmed remote. I just can't figure out what it is.