Question about Chamberlain 1/2-HP Whisper Drive Belt Drive Garage Access System

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My Chamberlain Whisper Drive bounces several times when it starts to close. It closes all the time, it just bounces at the beginning of the closing cycle. Can I stop the bouncing?

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The door itself might be too "hot". Meaning the springs might bee too wound up or stretched out at the beginning of the cycle. The belt drive openers actually have a spring on the trolley to take up any slack vibration to legnthen the life of the motor and drive gear so this is not really a big deal unless it is severe. If it is I would hire a pro as the springs are the most dangerous part of a door and should be worked on by a qualified technician. Thanks BB

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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1 Answer

Door will back up when closeing


unit is encountering too much resistance during closing cycle and reverses itself as if it is hitting something. You need to increase the closing pressure control to overpower the resistance. OR, clean and lubricate the rails to reduce friction and see what happens.

Nov 03, 2013 | Chamberlain 1/2-HP Whisper Drive Belt...

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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.

Jan 24, 2011 | Chamberlain 1/2-HP Whisper Drive Belt...

1 Answer

I have a chamberlain whisper drive garage door opener. When I open the door and it reaches the top it starts making a loud noise. It's like the motor is still trying to pull the door up but it can't...


SOUNDS LIKE THE UP LIMIT IS EITHER OUT OF ADJUSTMENT OR NOT WORKING.

TURN IT ABOUT THREE TURNS COUNTER CLOCKWISE. THIS SHOULD BE ENOUGH TO MAKE IT NOT OPEN ALL THE WAY. THEN ADJUST IT 1/2 TURN AT A TIME THE OTHER WAY UNTIL IT GETS CLOSE THEN SMALLER ADJUSTMENTS TILL YOU ARE HAPPY WITH WHERE IT STOPS.

HOPE THIS HELPS

Nov 04, 2010 | Chamberlain 1/2-HP Whisper Drive Belt...

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My garage door will not close. The door gets close to the ground, then starts back up again and when it gets to the top the lights flash.


Just got off the phone from one of the rep's of Chamberlain...Go to the sensor that is blinking(it should be the one with the green light) loosen the sensor until the light goes out, then tighten it back up until the light come back on, and push the garage door opener. it should reset the unit.

Oct 09, 2010 | Chamberlain 1/2-HP Whisper Drive Belt...

1 Answer

The belt on my Chamberlain Whisper Drive dipping


Where the belt attaches to the trolley carriage which attaches to the door there is a black adjustment nut with a spring on it. Tighten it up more by turning it clockwise until the belt tightens up. The belt will droop a little when the door is all the way shut normally but should not during operation. If you tighten it up too much the belt will slap on the rail during operation. Make sure the spring is set on the adjustment screw too. This holds the belt tight over time. Thanks BB

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

1 Answer

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.

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Chamberlain Whisper Belt Drive


door does not close without holding wall button in

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