Remember that the keypadlinc won't control a load, so unless you rewired your junction box a bit to give the keypadlinc power all the time, then this could be your problem. It can't be wired in series with your outlet like the old switch was. If you just hit a single button on the keypadlinc does the light flash at all? If not, then either it's not getting power or it's just dead. If it is getting power, and the lights flash when you hit the buttons, then you might just not be holding the two buttons down long enough. I've found that it takes more like 8 or 10 seconds for my keypadlinc to go into programming mode.

HTH,
Brett