Dito on what Herbert said about the sensor alignment. The fact that it does the same thing when the door is unhooked suggests it is the light sensor not the door.
I had the same problem earlier this week on a Sears opener. Adjusted every knob on it and no change. I finally looked at the sensor and it was way out of alignment. Straightened the sensor and the opener worked right again. It took a while to get all the knobs back to a good setup again.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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