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Old 05-25-2010, 09:59 PM   #1
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Garage Door Problem


My garage door opener has an intermittent problem. It will not close all the way unless you hold the wall switch throughout the closing cycle. One push of the wall switch (or the remote) will start the cycle but the door will reverse about after closing about 1/4 of the way. Push and hold the switch down and it will close all the way. There is no obstruction that I can detect, and the bottom sensor is aligned (best I can tell). The opener is a Stanley ST300. Any ideas?
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Old 05-26-2010, 05:11 AM   #2
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1 - Either one of the sensors are dirty
2 - Or you have a bad sensor.
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Old 05-26-2010, 05:56 AM   #3
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Door sensors(1 transmitter, 1 receiver) have LED lites, both should be lit. If something blocks the opening, or a sensor is not working or not aimed correctly, one lite will be out, and the door will only go down if the button is held. If the receiver lite is dim or flickers, check alignment. Also check for broken wires. If that fails to improve, replace sensor.
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Old 05-26-2010, 08:23 AM   #4
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Perhaps the auto-reverse sensor needs adjusting.
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Old 05-26-2010, 08:48 AM   #5
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I think it may be the receiver sensor. It just noticed it isn't lit, even though the transmitter is. When I adjust the receiver, the transmitter light goes out, but the receiver never goes on, so I don't think it is an alignment problem. It has no markings on it. Are replacements easily available (Lowe's, Home Depot, etc)?
Thanks
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Old 05-26-2010, 08:54 AM   #6
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Not familiar with stanley openers. In additions to what the others said, check and see if you have a down force adjustment. If you do, try applying more down force a little bit at a time until the door goes down on its own normally. Most doors will go down if you hold the wall button down. You are overriding the normal operation of the door. Clean the lenses of the eyes and make sure the led lights are glowing steady and not blinking. The other thing you might want to check is the door operation without the opener hooked up. Pull the release and run the door up and down by hand. It should be smooth in both directions and not require a big push at the start of its movement in either direction. I would particularly check the downward travel seeing as that's where the opener is acting up. Sometimes something as simple as a bad roller will cause to door to catch and not roll smoothly as it should. Let us know what you find.
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Old 05-26-2010, 10:11 PM   #7
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I released the door and checked the travel. It travels smoothly by hand. While released, the chain will not travel without the switch being held down, same as when the door is connected. I'm going to try to replace the sensor, although after checking prices at the big box stores, they seem awful expensive.
Thanks!
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Old 05-27-2010, 04:39 PM   #8
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Pg,
How old is the opener? The sensors you were talking about, are you referring to the electric eyes? If so, I am guessing you cleaned the lenses and made sure they are pointing at each other. If the opener is 8-10 years old or more, you might want to put the money towards a new one. The problem with trying to guess which part(s) are bad is normally when you buy any of the electrical components, they can't be returned. Keep us posted.
Mike Hawkins
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Old 05-27-2010, 06:50 PM   #9
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Adjust the down force before buying sensors. No cost!
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Old 05-27-2010, 09:51 PM   #10
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Opener is about 12 years old, if I read the date code correctly. The eyes are clean and pointed at each other. I'll try adjusting the down force tomorrow, assuming I can figure out which adjusting knob does that.
Thanks!
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Old 05-28-2010, 08:03 PM   #11
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Adjusting the downforce by about 1/8 turn did the trick. Glad I held off on buying new sensors. Thanks for the advice!
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Old 05-30-2010, 08:07 AM   #12
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That's great! Cheap is good!
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