I released the manual door opener and then tried to lock it back up but now it won't move door down
Sometimes if the clip is not reset then it wont catch the chain mechanism again to open or close the door. If you havent already reset the pull cord clip then that would be my guess. Try closing the garage door reset the clip with the rope attached, push it up til it clicks. and hit the garage door opener button. the rope and clip should move along the track until it hits the arm bracket where the garage door attaches to the chain mechanism.
If that does not do the trick then the clip has some screws on either side of the plastic casing and may need to be loosened and readjusted to match up with the garage door arm bracket and then locked back into place. That should do the trick if all esle fails, you may have to call the door company to come and correct the problem. Hope it works out!
SOURCE: Garage door drive stuck un up position
I found the chain extremely tight on the sproket. The mechanism had stalled hard against the stop bolt. I loosened the chain tensioner and the motor operated properly. Reset the limit adjustment so the mechanism stops a couple of inches from the stop bolt. Door is working fine now.
SOURCE: Sears Craftsman 1/2hp Garage Door Opener
Thats one of the symptoms of a lightning strike or a power surge. Without actually being there I would suggest replacing the back-board. But as with lightning strikes and power surges sometimes other electronic components could have been damaged as well.
SOURCE: lift-master chain drive garage door stuck at the protection bolt
you will have to find were the chain is binding look around the drive sprocket and check the chain to see if it is tight at the bottom or top this will tell you were to start looking for the problem.
SOURCE: Liftmaster 1/3 HP - humming, but does not open.
It's the gear drive. There are kits online for about $40, if you're semi-handy you can replace it yourself. Search for liftmaster replacement parts.
SOURCE: Where is the emergency release on Sears Craftsman Garage Door?
You can find exploded views and parts lists of the opener at SearsPartsDirect.com
I just checked.
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