Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Garage door take about 20 button pushes to open all the way, what is the spring supposed to look like? Is there one on each side or just one piece that should be connected? I just don't know if my spring is broken...

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To find out if your spring is broken wthout knowing you can spray a paint line all across the spring and then when you open the door the paint should go into a swirl if the spring is good if not the spring is broken.

Posted on Feb 02, 2010

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Posted on Jan 02, 2017

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LiftMaster garage door opener won't open. When push button (from either remote or "door-bell" style button on wall), unit makes a slight humming sound for a couple of seconds, then nothing...?


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1 Answer

Our LiftMaster garage door will begin to go up or down when we push the control but will stop. We have to push the control up to 20 time to finally get the door open or close


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Dec 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

When I push the button to open my garage door, the


Remove the cover and take a look at the drive gear. It is white nylon and is just in front of the motor. It is probably stripped. It is a good time to release the door from the opener and try raising it by hand. Your door springs may be weak or possibly broken.

Oct 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door won't close. I push the remote and


If your springs were sprung it would not be that easy to open.The reason it crashes down is because they have the door balanced good for the door opener.Check on the door opener itself and see where the reset button is.Maybe something was obstructing to not let it open..Look for the reset and that should get you going on the door opening and closing.Just going to have to figure it out why it did that..

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Sears Craftsman 1/2Hp Garage Door Opener - Opens on its own


There are three causes for this problem:
1. a remote is sticking or is getting bumped (if the vacation lock is on and it still has phantom operation remotes are not the issue).
2. the logic board could be going bad (if you have the 315Mhz you have a newer operator so this is probably not your issue)
3. the wires to the wall button have a short. Try disconnecting the wall button wires from the operator. If this stopps the phantom operaton you might solve your issue by running new wires to your wall button.

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