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Try turning your down force up alittle higher if your door is only wanting to go down a foot or so. If your light bulbs are flashing, you then have a problem with the safety eyes.
The sensors have nothing to do with your door opening. First thing to check are the door springs. One may be broken. Next remove the cover and check the drive gear. It is a white nylon gear just in front of the motor. It may be stripped.
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