LiftMaster 8365: Door Won't Close and Lights Blink.

Diagnostic code on the opener is 1 blink on the Up arrow, and 2 blinks on the Down arrow. This means there is an issue with the safety sensor wiring. So just recently one of our garage door openers encountered a problem where you hit the button to close the door, but instead of closing, the lights just blink. This is usually an issue with the safety sensors near the bottom of the track. If these sensors are either obstructed, or not working, the door will not close normally, but will open fine. The opener lights will also blink 10 times if there is a safety sensor issue. In the interim, you can force-close the door by pressing and holding either the wall button, or the down arrow on the opener until it fully closes, but the remotes will not work. Wiring issues can sometimes be tough to trace, but I think I did find the issue that ours was having.