I know you may be saying "It's the safety sensors" but wait, I just replaced the saftey sensors 3 weeks ago.
I replaced the sensors because of a similar problem: the door would go up but not down. Even using the wall switch you had to hold the button down the whole time or the door would start back up and light would blink 10 times.
I replaced the IR sensors (with ones that were compatible from Chamberlain) and that fixed the problem... for 3 weeks or so.
Now, the wall switch will work going down or up (without holding the button down) but the remote won't work to close the door. The remote will close the door sometimes when directly under the unit. When we're about to pull out of the driveway after exiting the garage, the remote does not close the door.
This is confusing to me, when I replaced the saftey sensors, I thought I had found the problem, I don't get why it worked for 3 weeks then this happens. I also put a surge protector on the power plug. I appreciate any suggestions.
Here is the specs on it:
Sears/Craftsman 1/2 HP Model: 139.536415RT Chain Drive