Maybe stripped gears in the opener. Sears openers strip the gears pretty often or so it seems to me. I am hoping you already have this figured out and fixed what ever the cause.
My son calls, his door opener stopped working. Opened the door by hand, it came completely off track. It's a double so we take it apart and rehang by sections, replaced the rollers. Went to utube to see how to adjust springs and cables. Got it working by hand again.
Checked the receptacle, no power. Climb into the attic to check, a squirrel had cut a wire. Fixed wire, opener motor works, but it won't lift the door.
Maybe stripped gears in the opener. Sears openers strip the gears pretty often or so it seems to me. I am hoping you already have this figured out and fixed what ever the cause.
when he opened by hand he had to trip a release. reset the rope hanging down, run trolley far enough to engage release.
X2! At least I hoped he hit the release. Or if he didn’t you may have striped gears.
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Gang, it is advised to check over your garage doors about once a year. Often springs/tension need adjusted to help out the motor and gears. Those little motors are not really designed to carry the load alone. Released and in manual, the doors should stay up between knee and waist high on their own when you let go of them, if not, adjust. Check safety systems too, and upper/lower limits. Clean and lube rails, rollers, and chain if applicable. White lithium spray lube, with the straw, is good stuff for this. Often our doors don't just "Go Out", there are little warnings to look out for. Look for deformity in the springs, note the end colors for weight ratings. On tension systems, you usually need "Winding Rods" of adequate length, do not substitute! Insist on good, cold roll steel, do not improvise!
Youtube is your friend, some may be a little misleading, but you will get the idea. A little door maintenance will keep it running smooth and quiet, and last longer.
And of course, safety first!