Some slideouts have a protective circuit on them. It may be a relay or a fuse on a small circuit board. If its in a Monaco there is a bank of relays near the batteries that may need some maintainance. If you have a trailer or 5th wheel you need to look in a cabinet in the room with the slide out usually down low in a protected area there should be a small circuit board with a fuse on it.
good luck finding it.