I have a Craftsman model 139.53600 garage door opener. While closing the door, the motor did not turn off and jammed the trolley against the trolley stop. The motor hums, gets hot, shuts off, cools and restarts the cycle. The down limit switch does not turn off the power to the motor. I unplugged the opener.
I released the door from the trolley and can operate the door manually. With the door released and the chain removed from the pulley, the motor runs in the direction to close the door. Unplugging and plugging does not change the direction. Pressing the wall switch pauses the motor, then it restarts in the same direction.
The gears are working properly and the down limit switch makes contact.
In recent years, I have had to adjust the down and up limit switches several times a year to keep the door in the proper position.
I would appreciate guidance on how to fix the opener.
Best Answer
Replace it, so you don't have to explain to somebody why you didn't replace it
I would replace this geezer of a GDO if I were in your shoes. It did quite well to make it to 32, but outlived its welcome as it most likely lacks the auto-reverse safeties of newer openers (namely, stall-reverse/inherent protection and photoeyes/photosensors), rendering it hazardous to operate in the way one would treat a newer opener.
This would also be a good time to inspect the door itself for proper manual functionality and adjustment.