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Back to the Garage door opener.
The Electronic eye is being block by something or most likely it is poorly aligned or loose. I have the same problem but I'm too lazy to fix it. On mine the eye is loose and the door moving vibrates enough to stop it and send it back up.
I'd bet your opener is blue it could be by several brand names but they are the same. The three blinks is the code for obstruction of the eye.
Sean
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