my remote won't turn tv on or off and it will not adjust volume. All it does is channel up or down?
Try reprogramming the remote using ALL of the codes found here: https://www.xfinity.com/support/remotes/
Jamesroman sounds like you may need to re-pair your remote. Check this out: https://www.xfinity.com/support/articles/programming-your-xfinity-remote