remote codes on a s3 and premiere using harmony one

The first thing, if you haven't already done it, is to use the TiVo remote to set the remote codes of each to something other than zero, and not the same. If they're in the same room, I'll assume you've done this.

When setting up the Harmony remote, tell it the model number and that you have the remote. Use the TiVo remote set to the right remote code to teach the Harmony a few commands. Skip the power toggle, since the TiVo doesn't have that code. After 3-5 commands, the remote will work for that TiVo.

Repeat the process for the second TiVo. Be sure you set inputs on your TV or AV receiver correctly.