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Either the motor has seized or the door itself has jammed. Unlock the manual release (Usually a cord or lever hanging down 1/2 way along the track) Sometimes if its a side mounted motor, the lever will be at the side of the motor .Pull the cord or move the lever, and the door should be able to be opened manually. If its stuck then you will need to check the tracks and rollers on the door and door frames to see whats jamming it. Repair or replace as required. If the door comes up freely, that will prove its not the door jamming.Try leaving the door in the manual position and turn the motor on. The door wont open or close itself when in the manual position, but the motor should run. If it still hums, I would say the motor has seized. Sometimes, its cheaper to get a new opener / motor complete assembly rather than a replacement motor on its own. Check with the manufacturer and or supplier of the door opener to confirm.
Remove the cover from the motor unit and you will find the drive gear has stripped. White sawdust all over. The part number for the gear kit is 41A2817 and it comes with instructions. It is available at any good door opener service company.
I think the trolley has jammed against the bolt just in front of the motor unit. Remove the bolt and then run the door until it is closed. With the door closed locate the 'up limit' control on the side of the motor unit. Turn this 2 turns in the opposite direction of the arrow printed on the cover. Replace the bolt.
Hello, You should have a cord in the middle if the track up high to release the door from the motor bracket. i would release it and confirm that the door will raise and lower with you pushing it. Then if the door feels free I would lower the door manual and go over the the inside button and press it to see if the motor will run without the pressure of the door. This will at least pinpoint where your problem is. The door itself could just be in a bind within the tracks so by releasing it from the motor that might free it up.