Problem with Garage Door - Stopping and Starting

if your saying that the light on door opener housing is flashing then stopping after a few moments , this is a sign of a fault in door safety's , either the door has to much friction now to move or beam detectors have sensed a problem

Hi, it is probably the safety photo beams out of alignment or not working, when this happens the garage opener goes into 'dead man' operating mode, ie you need to keep the button pressed for the door to operate. You can find user and installation manuals here - Liftmaster Garage Door Opener Installation Manuals

Make sure the sensors are still pointed at one another. If you tweak them and cannot get the light to come on the sensor is bad and must be replaced.

Press and hold for 3 seconds the button on the wall control with the lock icon. There you go.

there could be a short in the switch

lubricate track and drive chain or screw if it resists moving too hard it thinks it hit something and will back up

You need to reprogram the keypad. Press and release the learn button on the back of the motor. Within 20 seconds, press your four digit code into the keypad and press and hold the enter button until the lightbulb on the motor blinks once. You are finished.

Make a slight adjustment to the Upward force on the side of the machine. Turn the screw a 1/4 turn each time and test, see if that helps. Also, make sure there are no obstructions or friction when the door opens and closes. Try it manually first.

Chance are they set there remote when you were using yours. To reset your opener you need to clear all the codes on the back of your opener itself there is a square button purple or red depends on how old it is. Press and hold that button until the LCD light turns off. Press your remote to make sure it has stopped working. Then press the button again only for a sec until the light comes on and starts to flash then press your remote button. Repeat for each remote.

push again the button when is reversing it will stop