Garage Door 8355W only part closes then reverses

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I have a Model 8355W and when I tap the close button the door travels a few feet then reverses and the lights flash...only holding the button down closes the door all the way.  The diagnostic lights don't match anything in the manual: 3 up arrows and 6 down arrows.  I've cleaned the sensors and they are both solid green on the left and solid amber on the right.  I'd like to fix it without calling a a technician...any advice?
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george krukis

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Posted 1 month ago

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Michael Parker

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Sound like you have something blocking the sensors or the sensors are not properly lined up and so the system thinks there is an obstruction and to prevent crushing anyone it goes back up

it could also be sunrise or sunset I had the same problem in the mornings in the spring and in the evenings in the fall of the sun breaking the beam I have since moved the sensors for their back and they are out of the way of the sun light now and I am no longer impacted
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Don Kendall

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This is classic obstruction sensor behavior. They are probably blinking due to movement of the door. Make sure the sensors stay solid green through the complete cycle.