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Moore o matic garage door opener model 800.The door goes down 2 panels the reverses to up.

I have already lubed the track and rollers with teflon spray. Tried to adjust the travel with the set screws in the back of the unit. I've had this problem before. I just didn't use it for a couple of days and I guess it reset itself.

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Diamond E
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SOURCE: programming garage door opener

http://www.aaaremotes.com/linearx.html http://www.chamberlain-diy.com/pdfdocs/114A2504.pdf 1rst is to purchase the second is a manual index.

Posted on Sep 13, 2007

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1 Answer

Liftmaster GDO goes up 1/2 way and stops,springs are fine.


The Liftmaster openers have 4 movement switches, a )opening and b) closing limit and c) opening and d) closing force. First check the door for smooth operation by opening the door by hand (disconnect from the opener with the release cord). Any binding should be felt this way. It is possible for a binding hinge, roller or torsion springs to add too much drag and cause the force switch to shut off the motor. Hinges, roller shafts and torsion springs should be lubricated at least annually with a non oily spray (silicone or teflon spray). Not WD-40 or 3-in-1! A light band of lube should be applied to the torsion spring coils. If the door can be operated smoothly by hand, then adjust the closing force switch 1/4 turn at a time. This is a safety device do not use it to overcome another problem!

Aug 15, 2014 | liftmaster Garage Door 1/2 Hp

1 Answer

I have Sears Craftman 1/2 HP garage door open that want stay shut when you push the remote the sensor wire broke fix that. Now the door goes down and come back up. All sensor are led light are green...


Check the sensors again. Our unit has one amber and one green when working and if something (even a weed) breaks the optical beam it reverses and the lights blink. We've also had bright sunlight interrupt the beam. (The test for this issue is to stand such that you cast a shadow onto the sensor without being in the beam and then attempt to close the door with the remote). Next check if the door is binding during travel. If it is, check the tracks for plumb with a level and make sure the door rollers and tracks are undamaged. If a rail is crimped anywhere, it could be cause the problem. You can find some garage door sales places that sell the track sections and rollers to replace damaged parts. Check your local phone book and call around. In some cases, the door jamb may be damaged (lowering the header and shrinking the entire door area). This may require calling a professional to fix.

If the door itself is moving easily, then it sounds like the door might be hitting the floor too lightly or trying to go past the floor and triggering a safety reverse. On most of the openers, there are several adjustments you can work on to reset this. First try adjusting the down limit to above the floor and then bring it back to the floor. (However, usually these do not make the opener light blink.)

Alternatively, adjust the downward force to a higher value.

Without knowing the model of your Craftsman opener, I'll just use the directions for mine. All of these are adjusted with a flat blade screwdriver. Always test each adjustment with a complete up and down cycle.

The height limit control is on the side. (It's the forward one of two screws inside the cover - you should be able to reach them thtrough holes in the cover. Unfortunately, sometimes it's easier to get to them after removing the cover. The cover is held by 4 screws - 2 on each side.) To decrease the travel, turn the Down screw clockwise. One full turn of the screw is 2" of door travel.

The force controls are on the back with the down adjustment on the right. Turn this clockwise in 10 degree increments and test each time.

It is possible to overheat the opener with too many open and close cycles. In that case stop adjusting the unit and wait 15 minutes for it to cool.

I hope this helps.

Cindy Wells

Nov 27, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door will not open, the door gets close to the ground, then back up again. one sensor is green and other one yellow color. Please help me. My email- frooty2cute@yahoo.com


LUBE THE SPRINGS AND ROLLERS WITH WD40.

WATCH THE SENSOR LIGHTS TO SEE IF THEY GO OFF JUST BEFORE THE DOOR CLOSES. IF THIS IS THE PROBLEM EITHER ADJUST THE TRACK OR MOUNT THE SENSORS TO THE WALL INSTEAD.

IF THE SENSORS STAY LIT AND THE DOOR STILL REVERSES AFTER LUBE. ADJUST THE DOWN SENSITIVITY ABOUT 1/8 TURN AT A TIME (LESS SENSITIVE) ID YOU HAVE TO ADJUST THE SENSITIVITY MORE THAN 3/4 YOU WILL NEED TO CALL A PRO OUT TO CHECK THE PROBLEM.

HOPE THIS HELPS

Oct 19, 2010 | Chamberlain 1/2-HP Whisper Drive Belt...

1 Answer

Garage door: on calm day panels are weather tight


Garage door work like a wedge. As it goes down the door get closer to the jam. So if you moove the weather stips closer to the door that probebly solve your problem. Do that whith the door complitely close.

Good day Paul

Feb 10, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door not opening properly.


Check the springs on your garage door. If one is broken, the opener will not have enough power to raise up and it will stop like that.Or the up and down limit settings have gone off or bad.

Dec 08, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door opener has problem opening door


Neither the chain nor the track require lubricant. The roller bearings, the hinges and the rail need lubricated from time to time.

On the rear of the motor unit you will find a control "up force." Increase this about a quarter turn.

Jun 11, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener does not reverse after hitting obstruction


release the door from the opener and see if door moves freely the check proper torsion by moving door up to 3-4 ft if it stays in this area torsion is properly set if not call technician to adjust torsion
if door does not move freely all the way up and down check for binding track alighnment and roller condition. the adjust closing pressure.

Jan 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

1/2 hp craftsman garage door opener won't open when cold


I called Sears garage door customer service number due to the same issue. The test is to disengage the opener drive by pulling the emergency disengage handle, then open the door half way manually and then let it go. If it stays there it is a door/track/lub problem; if it drops down and closes its a garage door opener problem. Mine stayed open half way during this test so it was a door/track/lub problem. After using silicone spray on all tracks, rollers, and springs mine has been working great. Good luck.........

Dec 10, 2008 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Chamberlain Liftmaster Professional 1/2 HP


Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.

Jul 21, 2008 | Sears Craftsman LiftMaster Chamberlain...

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