my garage door starts to open and then closes again. Nothing is blocking the sensor.?

Answer 1

At the back of the opener you can adjust the amount of pressure the motor uses to open the door, It is very simple

Answer 2

If both your diode lights (green and amber) are on and the problem persists make sure the door works easily by hand you might have a RPM sensor problem. The device is on the end of the motor shaft. Sometimes the bearing gives and coats the sensor with metal powder, causing it to fail. Plastic gear shavings can do this too. First try holding the wall button down constantly and see if the door will close. Hold it until the door is all the way down, or it will reverse and go back up.

Answer 3

Is your garage door opener one of the ones with dip switches? You could have a neighbor who has a simmilar garage door on the same frequency.

If so, just change the dip switches in the remote and the opener.

If this happens frequently, you might want to try removing the batteries from the remote control or going on the opener and disconnecting the sensor to see if it might be faulty.

Answer 4

Well it sounds like a rpm sensor. i cant be 100 % sure. but the photo eyes (safty beam) only stop and reverse the door when it is coming down. they will not stop your door on the way up and make it close.

best way to fix this is trial and error. the only other thing i could be is a logic board. and if thats the case. it will be best to replace the opener.

rpm sensor is a small little computer chip about 1"x1" or so. normaly located close to the motor. this chip if it needs to be replaced should run you for about $20. a logic board will most likly cost $150-$200. and when a new opener installed only costs $300. its kind of a gamble.

best bet. call your friendly naborhood door man. he should be able to get you up and running

Answer 5

Then the door is either cocked or binding up when it is raising. When the motors on garage door sense any kind of stress on them, they will reverse. Release the door and see if you can raise the door manually. If you can and the door raises smoothly, then it could be that the sensitivity on the opener is very, very, sensitive, so when the door raises, there is a lot of stress on the door and it lowers. Let me know what you find out. tony

Answer 6

Ughhh.....my garage door does that same thing. Is it old???? What I do is kick the sensor a little bit. If it is old i recommend getting a more modern one. Hope that helps!

Answer 7

You may find that there is some form of electronic interference. Most domestic (and even many commercial) electronic products are required to accept any incoming interference. The reason for this is so that they themselves can't potentially interfere with things like emergency radio channels, television and / radio broadcasting, mobile phone frequencies, etc.

Have a look at the area surrounding your house and look to see if there are any mobile phone towers or high voltage power lines nearby.

Answer 8

You have to put a ladder up in the garage to the opener unit itself the will be one + (plus) button and one - (minus) button. You have to tinker with those until it works.
Chamberlain makes most openers for everyone. Go to their website, type in your unit and you can get proper instructions for it. Be safe.

Answer 9

you sure? this happend to me recently and i kept saying the same. then i noticed that if anything was remotely close it would make it go up and down. guess what it was.

a spider web. was barely in the ranges of the censor. when i pulled it away its worked just fine. but hey i could be wrong in your case.

Answer 10

Make sure the chain doesn't have anything applying resistance
to it. If the chain has too much slack, it could be grabbing
onto the rod.