Craftsman 1/2 HP GDO - Partially Opening

drgwytherNovember 6, 2010

My 1995 Craftsman 1/2 HP garage door opener, Part No. 41A4315-6C starts to open the door, but then it immediately reverses. Doesn't matter if I am using my car remote(s), the outside keypad or the inside switch. When it occurs, the light flashes on and off and there is a clicking from the power unit for about 5 seconds. The door will shut if I hold the button inside the garage down, and it will open normally after that from any of the remotes. It only has a problem when trying to shut it. The sensors (that stop it from closing if blocked)are clear and seem fine. The rollers all appear in proper place, and are lubricated fine. What am I missing?

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Anytime you try to close the door the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a bit. If you cannot get both lights to come on you have either a bad sensor or the wiring to them is bad.

    Bookmark   November 8, 2010 at 10:03AM
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I've read my situation over and again, but have tried all suggestions. I've changed the worm gear and sprocket with no problems. Now the opener goes about 1 foot one way and reversed itself back to the start point. The assembly on the shaft is taught. The black plastic rotary wheel rotates with no problem thru the sensor. I guess my next step is to buy a new sensor. Just not sure how this would have gotten damaged. It wasn't touched while replacing the gears other than removing the wires plugged to it. If there's a reset button or any suggestions for a fix, I'd be greatly appreciative. Thanks,

    Bookmark   November 27, 2010 at 3:06PM
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Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

    Bookmark   November 29, 2010 at 9:50AM
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