I just saw an earlier post that outlines the same problem that I am having. My garage door doesn't want to go down. It will start to close, go down a few inches and then go right back up again. Once it does this the lights will blink as if the sensors are obstructed yet they are not. I have been careful to clean the sensors of any dirt, cobwebs,etc. and I have made sure that there is nothing obstructing the sensors as well. I have had this problem occaisionally in the past couple of months but it seems to resolve itself on its own for no apparent reason as if it has a mind of it's own. I believe that the garage door is approx. 9-10 yrs old and I have an aluminum door.
One note to mention: About four months ago I closed the garage door and the garage door buckled in the center due to an improper support on the door that snapped. At the time, a technician came out and fixed the door and adjusted all of the up-down balances and oiled the door.
Any help with this would be greatly appreciated!! :-)
Thanks!