liftmaster Chamberlain Garage Door Opener Transmitter 300MC "beams thats green" Questions

Door will go down until it gets close to the sensors (transmitters) and then it hesitates and goes back up. One of the sensors has a constant green light which tells me that it works properly, but the

I just did a replacement kit on the nylon gears of the opener. I've done this several times on this one and others so, not unknowledgeable. However, when I put it back up, the thing just progresses ...

won't open or close tries to run but stops the yellow light on rear of unit blinks 4 times then a pause and blinks 4 times again, can open and close while using the manuel bottons on the back of the ...

door opened and will not close or open now I have a liftmaster Formula 1 1280R. Door is "stuck" open. Opened with remote, tried to close with wall button, lights came on but no motor. Disconnected ...

the door will open just fine, when closeing the door (by the wall switch) it will not close unless you hold the buttom down. The sensors at the bottom of the door has a green light on one side nad the

When the door closes, it automatically reopens. There are no obstructions so that isn't the issue. If I disconnect the door and cycle the automatic is closes and then immediately reopens. make sure ...

...beams on eack side of the floor. like bugs spiders cob webs all can trigger it. wiggle them and make sure the eyes line up so that you receive a green light, if all ok try this, get a ladder and on ...

When I press pad in garage and hold, door will open and close. If I press once like I am suppose to do when it operates as it should, then it stops after a bit and the light flashes. When I use remote