Without knowing anything else about your RV, I am going to say that you need to check out the control module for that slide.
In the newer RV's each slide is controlled by a module that the manufacturer can help you locate.
This module, with most RV's, is the same for each slide. So, the first thing you should do is swap this slides module with one of the modules that control your other slides. If the rocker switch burns up after a swap, then you need to look at the drive mechanism for that slide.