I recently bought wireless keyless remote for my Craftsman Garage door opener(model 18458). The package of the wireless keyless entry indicates it works with all 18000 series units, so I am not sure why the one I just bought does not work. I called Sears and the went through all the steps with me and confirmed that the wireless keyless entry keypad did not work. I exchanged it as per the Sears reps instructions but the replacement is having the same issues. Could it be the garage door opener unit is the problem? What else should I do?