That is a two-flash code. It means either the wires to the safety sensors have a short in them, or one or both sensors are wired incorrectly at the motor unit. What you describe sounds like there may be a break in the wire, and the door causes the tracks to move just enough to open that break in the sensors. There could be a staple through the wires causing a short (I've done that when using a staple gun), and that could be your problem. Check your sensor wires from the motor down to the sensors themselves, and be sure they have a little bit of wiggle room. If you find a staple or something has cut the wires and caused a short, you can separate the wires a bit, and wrap each side separately with electrical tape.
SOURCE: craftsman 3/4 hp garage door opener
not sure, but see the users manual here:
http://www.manualslib.com/manual/32293/Craftsman-139-5399.html
SOURCE: How do i program my garage ope
Take your old remote and point it at the new remote while pressing 'learn' (or you might only press learn and then shoot the old signal into the new remote). Almost impossible without the old remote though. Hope this works.
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