Best place to start is getting the correct info and that means we need to know what you have! Looking deeper, I see in your info that you have a 31 E model but when checking the info, I find no 310 E. that throws a hitch in the search for good info!
So do you have the manual they list for the slideout operation?
Best to get the info straight from the manual but there may be some basic things that can get overlooked. I get these pointers from the owners manual section 10. Maybe worth a check that brake is on , engine running, before starting to move the slide?
Doing it without the engine running can mean it gets low voltage and draws high current to possibly trip a fuse at some point? But the owners manual also describes a reset routine that gets too involved to cut and snip that info as there is too much.
Error codes and how to find and read them!
Good luck on the chase!