Please edit your thread title to indicate that these universal codes are for RCA brand remotes. They may not be usable for any remotes other than RCA brand. For instance, all of the codes to set a TiVo to control a TV or an audio/video amp are four digit codes, and this linked site has all three digit codes.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw