I have a craftsman garage door opener that works great except one problem when you open it it only stays up for 10 or 20 seconds then it starts to automaticly close and if you reverse that and open it it closes the same way. I've tried every thing I know how to do with it dose any one know how to make it work properly?????
First, locate your manual, or get one online, as they contain a lot of useful information, including troubleshooting, etc. Mean time, how old is it? chain drive? belt? screw? Have you been through the installation and setup procedures, and, if applicable, checked the chain or belt tension? Have you looked to see if whatever is used to switch the limit switches is actually getting to the limit switch? If a chain drive, sounds possible that you have too much slack in it. If everything else checks out, probably a board.