Are the sensors lined up? They will get voltage without being aligned. Batteries good? Try opening the door by the button on wall or touch the contacts on back of motor with something conductive to act like the remote and see if it opens. This will tell you either remote or sensor issue or the opener itself
SOURCE: Lift-Master garage door opener Model 1045-6 1/3 hp
There is a thermal cut out in the motor, usually the motor must cool before the opener will operate again. If the opener only operates 3 times it must be heating up too quickly.
First you opener is only made to do your job for you, which is opening and closing the door. If the door does not operate properly manually the opener will not operate properly.
When the door is disconnected from the opener it should lift easilly, it should basically stay at whatever point you let go of it (midway and fully open) and it should close without slamming down. It does not matter what size the door is!!! If it does not something is wrong with your springs and the door can be VERY DANGEROUS!!
With that being said it sounds more like a static lock-up possibly a loose ground or even a circuit problem in the home.
Bryan
SOURCE: Garage door only opens with wall unit
a component in the wall unit is failing , that makes the conection happen when the remote signal is recieved , ( it is recieving the remote signal but not sending it out to the control circuit for the motor )
SOURCE: Garage Door only opens with wall unitq
The unit is in the lock mode, push and hold the lock button in for about two seconds and the green LED should stop flashing. Your remotes should work.
SOURCE: Lift-Master garage door opener stopped working
The motor will probably need rewinding.
Professional job. Don't forget to take the condensor with the motor.
Or alternatively, if money isn't a problem,, get somebody out to look at it.
There ya go:)
SOURCE: professional series, lift master 1/3 hp
Check to see if the small light in the wall pad is blinking. If so press and hold the button with the lock icon for 3 seconds.
If this isn't the case your receiver may have failed. The wall button works without the receiver;
I would remove the logic board and look for loose or missing traces on the printed circuit board.
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