I wanted to reply back and thank IndyUser and everyone else in the thread! I had the exact same problem with my brand new 620 received today from Amazon. I could not get it to Learn one command from three different remotes until I replaced my standard Sanyo Eneloop rechargeables with brand new Energizers. Once the non-rechargeables were installed, the 620 learned all of the functions that it would not learn moments earlier with the Eneloop rechargeables installed.