Barb:
Many of these doors require a coiled spring either overhead or off to the sides that assist in lifting the door. If the overhead coil has come undone or broken you and the electric lift motor cannot lift that much weight. If the springs are in good working order and adjusted right, then the door is just balanced so that a small lift by the person or the electric opener will easily open the door. Bear in mind that for a person to lift the door, you first have to disengage the pull lock that couples the door to the motor chain. If you have done this and cannot lift the door, then the helper springs are the problem.
1. disconnect the door from the chain. 2. inspect the door again, try oiling the rollers and joints. It is the chain that lifts the door. Try manually lifting the door. If it still does not lift open, it is the door and not the Opener unit. 3. Although you don't see kinks, look for any obstructions eg. the track. 4. Make sure the track has not lossened out at any point. 5 If you can lift the door,. connect with the chain. Goog luck. Basically I think it is the door mechanism that has some how misalligned.
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: GARAGE DOOR OPENS BUT WILL NOT CLOSE AUTOMATICALLY
is bulb on motor flashing 10 times. then you have electric eye problem. otherwise, sounds like you need to increase down force a hair. adjustement is on logic board, right knob.
SOURCE: motor runs but door does not open
you have a stripped gear on your opener. Replace gear and sprocket kit
SOURCE: Garage door shakes as if off balance when closing
SOURCE: Garage door opener won't open or close door
The drive gear is stripped. Remove the cover and you can see it just in front of the motor. It is white nylon and the part number is 41A2817. Available from Sears or any good door opener service company. It will come with instructions.
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