Craftsman garagedor opener

SOURCE: Craftsman Garage Door Opener Won't Open

When mine did this, it was because the nylon gears that drive the chain had stripped. My wife had to live without the opener for a week or more, but I was able to find a new gear kit online and replace the damaged gears. It wasn't difficult.
The other option is to buy a new opener.

SOURCE: Old Craftsman garage door opener starts to close then opens again

try adding a little more down force

SOURCE: keypad garage door opener will not operate

what keypad are you using with new opener? Frequency has changed. can't use old one. you probably never needed to change things; just needed to follow proper coding procedures.

SOURCE: 1.3HP CRAFTSMAN CHAMPION GARAGE DOOR OPENER-NEW IN 2004

Well sounds like its a pressure setting. you said you open the door by hand? Was it easy to do? Ask your self this can a 15 year old kid open it and close it? If so then it sounds like its a presure setting There should be two blue slots on your opener with numbers 1-9 says up and down force. Turn the up force towards the bigger number. Just a little bit. But before you do that as the other guy stated make sure that your cables and springs are working. Spring depending on your doors can be in three places but we going to assume you has the most common set up so look over the top of your door (with it closed) you should eb able to see a tube running across there. and somewhere in the in middle a set of spring look at the spring to make sure that you dont see any of the tube showing in the springs. Becare not to touch the spring as they are under a lot of stress.

SOURCE: Craftsman 1/2hp garage opener Homelink must be under unit to work

Have you tired reprogramming the remotes to the opener?

The opener receiver board may have failed, which happens. You can order a new one from Sears or other places on the Internet, and they are fairly easy to replace.

Once replaced, you will need to program the receiver to you remotes again.