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Manage My Life

Craftman Garage Door Opener hums but won't close door

by Manage My Life Last activity date:
January 17th

Sears 41A3621 1/2 HP Garage Door Opener, which I believe corresponds to Chamberlain Liftmaster Model Series 1300.

The door opener has worked well for years. Today we opened the door to its full open position but when we pressed the wall button to close door it would not close. Every time we press the button, the motor makes a temporary hum and then nothing happens. We ended up releasing the door and closing the door manually.

We looked through instruction manual which describes "the opener motor hums briefly, then won't work"

A) check garage door springs == they seem ok to us

B) Disable door lock == we pressed the lock button off and on via the wall unit controller; this did not fix the problem

We check floor sensors, both green lights are on there is not obstruction. The sensors appear properly aligned.

We tried unplugging unit and then plugging unit back in. This does not help. When we first plug unit back in to electricity, the small green light near the "learn" button is unlit. After we try to close door by pressing wall unit button, this green light goes from unlit to a pattern of five blinking lights, small unlit pause, then repeat with five bleaking lights, repeat. This might not have anything to do with the problem but I mention it just in case.

In summary, the door opener chain system is in the fully open position and will not attempt to close itself. Each time we press button to close we get a brief motor hum and then nothing happens.

Garage Door Openers , Appliances
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Answers (7)
David Meier
I just used this post and followed the same advice. Thanks very much for the detailed instructions!
by David Meier
January 17th
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Lyle W
Thanks for those comments Bill.
by Lyle W
February 5th, 2013
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Manage My Life
Team, Thanks for this,, I have same issue described above cept it's not a warm day in March.. I came here to research even though my intent was to follow the same actions as described AND what I performed about 5 years ago when this same thing happened,! When this happened last time, I loosened the chain, removed from sprocket / gear and the motor ran fine... Put it back together and all was well,! I'm a information junkie, LOVE the Internet for its knowledge base,, I think I'll research rocket surgery, in the event I'm ever in a position to have to perform,!
by Manage My Life
December 9th, 2012
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Manage My Life
I'm glad you got it back working again. Thank you for the detail of what you did with this. It's always helpful to other people and it can give them something to check for right off the bat in many cases.

If you have any other problems with it please stop back by and let us know.
by Manage My Life
March 14th, 2012
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Manage My Life
Wade, thank you for your help. The garage door now works again. You gave me the needed clue when you said that the problem sounded like a seized motor.

As you suggested, I first checked that the metal conecction point that attaches the "bicycle chain" part of the door closer to the actual door was not stuck or jammed. It seemed that it could move if the chain would move but of course the chain was not moving.

I will detail what I didn in case it is helpful to some one in the future who reads this thread:
I got the idea to take the "bicycle chain" off of the gear that comes off the garage door motor The bicycle chain is connected to a thin strong wire and the two together form a very long loop. One end of the loop (the chain end) is hooked around the sprokets of the gear coming out of the garage door opener. The other end (the wire end) is connected to a small pulley over the garage door opening. The chain and wire are connected by a headless threaded bolt that has two nuts. I was able to loosen one of the nuts to the greatest possible amount without actually disconnecting the wire from the chain. When it was loosened in this fashion, by pulling the chain taut, I was able to get the chain to come off the gear (like taking a bicycle chain off of a bicycle gear). Freed of the chain, I pressed the button that controls the garage door and the gear turned normally. I pressed the open/close button several times to make sure that the motor/gear was working. I put the chain back on the gear by pulling taut. Then I reversed the nut at the wire-chain interface. which pulled the chain back into its original taut configuration. I manually raised the garage door until it locked itself into the device that acts as an interface between the chain and the garage door. The door worked perfectly.
In summary, for some reason the motor/chain seived in the fully open position. To fix I had to take the chain off the gear, run motor without chain, then reattach chain.
by Manage My Life
March 13th, 2012
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Manage My Life
Check to make sure the end of the chain (threaded part) is not jammed back into the opener. If it opens too far it can become stuck and then not close. If that looks good, remove the cover and check the gears to make sure they're not jammed up. If they look good then it's very likely the motor has seized up or that the logic board is malfunctioning. Given that you hear the humming sounds, I would suspect the problem to be with the motor more than the logic board.

Let me know what you find.

Thank you for using Manage My Life!
by Manage My Life
March 12th, 2012
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Manage My Life
The Managemylife web site is a good resource to find out what may be happening with your Garage Door Opener. I did some research for you at and found an excellent article that also has multiple expert answers at the bottom of the web page that addresses the most common questions that have been asked by other members. I hope this will help until your expert can answer your specific question. I attached the link below.
Answered in 11 hours
by Manage My Life
March 11th, 2012
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