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

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I have a Chamberlain whisper drive 1/2 hp garage door opener model 9200 and when the weather is rainy or snowy out the door will close fully wait a second then open again. This happens until I can stop it from going up by hitting the button again to "reverse" the door. Is there any way to fully fix this problem so it doesn't happen any more?

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It sounds like the door is traveling just a bit too far in the down direction. Locate the 'down limit' adjustment on the side of the motor unit and turn the control in the opposite direction of the arrow printed on the cover. Some tweaking will be necessary to get it just right.

Posted on Oct 05, 2010

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Posted on Jan 02, 2017

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My new installed garage door opener closes and opens right away


You have to adjust the safety pressure sensor. It is set to too light a pressure. Check your manual for the adjustment.

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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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I have a Chamberlain Whisper Drive Security + model HD900D that is opening by itself awhile after the door has fully closed & I've gone into the house, sometimes its hours after the door fully closes....


If the door hits the floor too hard the safety will reverse it to the open position. This can be an intermittent situation. A bad wall control or the wiring to it will also cause this problem. To eliminate them you can remove the wire from terminal #1 on the rear of the motor unit. A staple in the wire can cut through the insulation.

Jan 01, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chamberlain door opener manual


You will have to go to chamberlain.com to download one. Or you can order a paper copy. www.chamberlain.com Just enter in your model number on the site. Thanks BB

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Upon pressing open/close button kitchen door the garage starts to close but then reopens after 3-4". one must then hold button until door is fully closed. what is remedy?


The problem is that your system does NOT "see" the safety "eyes" sensors. Make sure that your sensors are properly connected to the opener (both sensors should have lights on them, one amber and another green). If they do not, check the wiring and the connections at the opener itself.

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(Chamberlain 1/2 hp Whisper Drive garage door opener) the garage mounted opener will open the door, but none of the remotes now work. batteries have been changed already. Is there a way to reprogram the...


If the wall button will operate the door up but none of the devices do then look at the wall button. Find the lock button and push it for 2 seconds and then try the remotes again. This is your vacation lock. You can get a manual at chamberlain.com. Now if the door does not open or close with the remotes you can reprogram them. Press the colored learn button on the motor head and then press the button on the remote. Repeat for each remote. If they fail to program you will need a new logic board. Thanks BB

Aug 18, 2010 | Chamberlain 1/2-HP Whisper Drive Belt...

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Door would not close all the way


DOES IT REVERSE OR STOPS BUT NOT TOUCHING THE FLOOR?

IF IT DOESN'T TOUCH THE FLOOR YOU EITHER NEED TO ADJUST THE DOWN TRAVEL OR LENGTHEN THE CONNECTING ARM.

IF IT REVERSES YOU NEED TO DETERMINE IF IT IS THE SENSITIVITY OR THE SAFETY EYES.

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

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