I need the programming codes for a Zenith Universal remote that only has the letter "Z" at the bottom of the remote.

Here is a link for owner’s manuals for Zenith remotes. See if you can find yours. I had a problem opening the pdf files, but when I saved the file I could open it. Hope this helps. When you get there, highlight Service/parts, then click on owners manuals, for Product select accessory, and then click on search (no need to enter model number.

[Link: zenith.com]