Main slideout won't retract

Contact Glendale directly to inquire.

if it is hydraulic, then check the level of fluid in the reservoir. might help someone 'guess' your issue if you provided make, model of your RV along with other info such as - hydraulic with a reservoir and make/model of that, or electric slides, and the make/model of those.

no
it indicates that it is dry and needs lubrication in the slides and screw thread

check that both sides are moving evenly
from your statement only one side is moving and twisting the slides causing it to jam
if the action are screw threads , then it is possible that one side is not driving ( limit switch problem, no power etc)
If it is hydraulic check the ram operation on that side
(pin fallen out at end of ram)

Check to ensure nothing is blocking the slideout, its path or the gears of the motor. If you don't see a dimming of the lights when you push the retraction button or don't hear any motor noise check the fuse for the slideout motor. If all else fails there should be a manual slide retraction option somewhere that allows you to retract the slideout using a crank or a power drill. Check the owner's manual.

Is this the system with the cables on the side? If so, they should, via a system of pulleys, be routed to the top of the slide on the inside of the coach. There you will see a few adjustment points. Before you do that, have you lubed the slide seals? If not, use 100% silicone spray and lube the seals good. The seals can get tacky and grab the slide making it jump when in motion. You will also want to mark the adjustment bolt before making any adjustments just incase you need to go back to the original setting.

There will be an inline circuit breaker that controls the power for the slide. Some are automatic reset and others have a small black button on the side that will need to be pushed in to reset. These are usually located in an outside storage compartment.

Not sure what kind of trailer you have, but the fuses should be behind a metal cover - for mine, its located under the refrigerator. When you open it, you will see all of the fuses. Hopefully, they are labeled, but don't bet on it. Use a meter to check the fuses - put the meter tip on each side of the fuse, with the meter on volts. If you read 12 - 14 volts, the fuse is blown. A good fuse will not show any voltage.

If you can't find the fuse box, when you have the camper plugged into AC, turn on all the lights - the fan that cools the inverter should come on - follow that sound and you will find the fuses. Good Luck

check fuse for power then wiring for power to motor then check motor for operation then gear or pully system and slides for a seized condition

check then circuit for power to the motor then check for a seized condition also check the switch for operation