Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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The garage door closes and then opens up again, I have to close it several times before it secures. There are no obstructions. Is this a sensitivity problem?

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More than one thing can cause this type problem.

If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is not flickering ever so slightly.

If the door reverses when it hits the floor it is a sign that the door is traveling a bit to far. The adjustment for this is on the side of the motor unit. Turn the 'down limit' in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary.

Posted on Jul 06, 2010

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Replace the garage door drive gear parts due to stripped gear. They sold me a complete repair kit. Now the garage door opens and closes but when closing it contacts the floor stops and then reverses.also when opening it hits the stop with enough force to temporaly bow the overhead track. I have adjusted the up and down force to minimal and the door close several times with no appreciable change. What's next?
Thanks
Jim

Posted on Jul 08, 2010

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Erratic garage door opener


It is an adjustment problem. Any obstruction and the door goes up again. So try adjusting again but don't leave space to invite rodents that will cause damage to car wiring. I am just going thru that.

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The motor runs but it only opens a few inches and slowly goes back down its a chamberlain whisper drive model HD900D


Hi. I have seen this before, although usually not from chamberlain garage door openers.

Pull the release cord that unlocks the door from the opener, and manually open the door ALL the way open.

Then lock back in place in the open position.

Then use automatic opener to shut door.

It will close very slowly, but should close all the way.

Then, open the door again using the remote, and the door will once again open slowly, this time it should open all the way.

Then close door with remote, and door should now close as it is supposed, with the proper speed.

The slow opening and shutting is the system position sensor resetting itself.

This is why your door is acting up.

I would also look up by the belt drive connects to the front of the garage door opening, to make sure there isn't any dirt, cobwebs, or other obstructions on the sensor that may cause it to re-close the way it does.

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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.

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My Craftsman garage door opener opens fine. It


It could be closing too far or the sensitivity could be set too sensitive.

Lube the springs, wd-40 rust may be the whole problem.

If the door hits and the opener continues to move until the rail flexes upward and then reverses - probably the travel adjustment.

Does the door close and stay closed if you hold the wall button down constant until it closes? - this would indicate a safety eye problem.

If the door reverses before it hits the floor or just as it hits the floor it could be the sensitivity or if the safety eyes are mounted to the track they could be flexing enough to move the eyes out of alignment.

Hope this helps.


Jul 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The door only opens partially and then stops


IF THE DOOR WORKS WELL MANUALLY.

ADJUST THE UP SENSITIVITY ABOUT 1/8 TURN AND TRY AGAIN.

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Jun 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The door reverses back to open position instead of closing


SOUNDS LIKE A SENSITIVITY ISSUE UNHOOK THE DOOR AND TRY IT MANUALLY TO BE SURE IT DOESN'T BIND OR IS TOO HARD TO OPEN OR CLOSE.

IF ALL IS WELL CHECK THE SENSITIVITY SETTINGS ON THE BACK OR SIDE OF THE OPENER.

YOU WANT THIS SET AS LOW AS POSSIBLE AND STILL OPERATE THE DOOR WITHOUT REVERSING.

NOTE: THE FULL RANGE OF ADJUSTMENT IS ONLY ABOUT 3/4 TURN SO MAKE A VERY SLIGHT ADJUSTMENT AND THEN TRY IT AGAIN.

HOPE THIS HELPS

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1 Answer

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IF YOUR SAFETY EYES ARE MOUNTED TO THE TRACK THEY MAY BE MOVING OUT OF ALIGNMENT AS THE DOOR NEARS THE CLOSED POSITION.
WILL THE DOOR CLOSE NORMALLY IF YOU HOLD DOWN THE WALL BUTTON?
IF THE DOOR CLOSES NORMALLY YOU ARE OVERRIDING THE SAFETY EYES AND WILL FIND THE PROBLEM THERE.
IF IT STILL STOPS THE DOOR MAY BE TOO TIGHT AT THE FLOOR - HOW DOES IT WORK MANUALLY?

IF THE DOOR SEEMS OK MANUALLY THEN CHECK THE SENSITIVITY IT IS ONLY 3/4 TURN FROM MIN. TO MAX. SMALL ADJUSTMENTS 1/8 TURN AT A TIME CLOCKWISE - DO NOT SET THIS ANY FURTHER THAN YOU NEED - IT IS A SAFETY ISSUE.

HOPE THIS HELPS

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1 Answer

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try adjusted the sensor controls on the sode of the unit other wise replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

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