Craftsman Garage Door Opener Problem

jt2006December 10, 2006

Have a 1/2 HP Craftsman Garage Door Opener (41A5021-2D). Wife opened the garage the other night but when she went to lower it with wall switch, the unit only makes a click and lights come on (no flashing). No movement to move the chain. The yellow (amber) light next to red square switch flashes 5 times then pauses then flashes 5 times again. Would the circuit board be the problem? Sensors at Door bottom are solid green so they should not be the problem. Any advice would be appreciated.

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Make sure the trolley is not Jammed under the stop nut in the up postion. If so, back that nut off run the door down and turn the up limit counter clock wise until the door is in the desired up position.

    Bookmark   December 12, 2006 at 6:55PM
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I had the EXACT same issue just this morning. Opened fine but would not close and the same flashing light sequence. Door sensors wer perfectly aligned.
I did as doorguy suggested and found that yes it was jammed against the stop nut. After loosening the stop nut, the door went back down just fine. I then adjusted the up limit screw to ensure the door stops about 1" from the stop nut. It now works fine.

    Bookmark   December 13, 2006 at 1:26PM
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Wish it was that easy for me. Trolley is actually about 4 inches away from stop nut, back is starting to hurt from having to have to do actually physical exercise (rantings of an lazy 40ish male). When I press wall mount opener, you hear first click, then second click about 2-3 seconds later. Lights work fine on opener. If I unplug and plug opener back in, both lights on unit light and remain lit. If it is circuit board, is it worth replacing (cost roughly 70+ bucks), seen alot of complaints about plastic screws shredding, mine is perfectly clean, not a shaving to be found. Thanks again for any help.

    Bookmark   December 16, 2006 at 2:28PM
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It sounds like your motor is locked up. To be sure you can loosen the chain and take it off the sprocket and hit the button and see if it runs. Otherwise I am sorry to say you may have to replace it.

    Bookmark   December 16, 2006 at 6:28PM
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Hello, I'm experiencing the same symptoms as JT2006. The opener will go up, but not down.

The trolley was tight against the stop nut, so I loostened the chain. When I hit the switch, the opener ran and pulled the trolley into the stop nut again.

I took the chain off the sprocket, pulled the cover off, and manually spun the motor down until the limit switch wasn't making contact. I hit the switch again, and the motor kicked in and ran in the open direction.

What is it that signals the motor to switch direction? Is there a sensor malfunctioning, or could the control board be failing?

    Bookmark   January 5, 2007 at 12:27AM
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johnsoer what you seem to be running into is a logic board that hasn't been satisfied that the door is open so it keeps trying to open the door. Remove that bolt and nut. On the side of your motor unit you will find a control marked 'up limit'. Use a small screwdriver and turn this control about 4 or 5 turns in the opposite direction of the arrow printed on the cover. You may need to do some further adjustments with the up and down limits because you removed the chain. A good thing to remember about this forum is to post first, remove and adjust last.

    Bookmark   January 5, 2007 at 6:53PM
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Thanks for the suggestion don_1. I tried that, but the opener still only wants to go up. A quick look at the logic board showed one sligltly singed connection where the solder isn't making good contact.

I'll try swapping control boards with my other (identical) opener and see if either of them work.

    Bookmark   January 5, 2007 at 10:51PM
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I have a 1/2 HP craftsman opener. About 3 weeks ago, I had to replace the nylon drive gear because the orignal one had been ground down to nothing. The opener worked fine for the past few weeks until tonight. I opener was running but wouldn't open the door. So, I opened the unit and discovered that the new drive gear has been stripped! Any ideas what would cause this? If I replace the gear again, what can I do to prevent it from getting stripped a 3rd time? One other thing to note, the green light on the back of the unit keeps flashing five times in a row, pauses and then flashes five more times. It is doing this continually.
Any help or advice would be greatly appreciated!!

    Bookmark   January 27, 2009 at 8:51PM
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Did you lubricate the new gear? Check your door. If your door is excessively heavy it will cause this. If your door is properly balanced and the springs are okay it will stay in place when you have it about waist to chest high.

    Bookmark   January 28, 2009 at 9:51AM
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I think the door is balanced and the springs OK. I checked it as you said and it did stay in place.
As for the lubrication, I think I did something dumb during installation of the new nlyon gear. The installation instructions said to apply grease generously to each tooth of the drive gear. I thought it was talking about the sprocket (that drives the chain) so that's where I applied the grease. Not on the nylon gear.
I'm not sure what I was thinking!
Would not having grease on the nylon gear cause it to become stripped in a few weeks of normal usage?

    Bookmark   January 28, 2009 at 4:25PM
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    Bookmark   January 28, 2009 at 4:27PM
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About 80% of the time my garage door only opens half way. The other 20% it works fine. Do you have any suggestions?

    Bookmark   March 12, 2011 at 8:46PM
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I have a 1/2 HP Craftsman Model 139.53491SRT garage door opener. It's worked fine for the past several years when one day the "Travel limit" for the up position stopped working. I adjusted the "up adjustment screw" but when it opens it still doesn't stop until it hits the opener casting. I adjusted the screw "counter clockwise" and no change. I also tried to adjust it clockwise, but no change. Any thoughts as to what the problem is and how I could repair it? Thanks....

    Bookmark   April 16, 2013 at 1:04PM
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My craftsman garage door opener works from the wall switch but will not work with the remote. I bought a new remote and that doesn't work either. It is a new unit that has been in the box a long time.

    Bookmark   May 18, 2013 at 6:15PM
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I have a Craftsman 1/2 HP garage door opener, model 139.53962SRT1. For both the manual and remote controls, the door opens correctly and it starts to close properly, but it automatically opens again when it reaches the closed position. The light on the unit flashes when it automatically opens on its own. It will close when using the manual control if I hold the button down until the door reaches the closed position.

The symptoms are like there is something under the door that is keeping it from closing. I have used the door opener for several years and it was serviced about one year ago.

    Bookmark   February 7, 2014 at 8:10PM
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Model: 18473DM
It is new door opener. The light bulb was blinking when opens or closes, but OK at stable position. Now the light does not come on at all. The bulb is good. Any idea why?

    Bookmark   May 5, 2014 at 11:53PM
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