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Craftman Garage Door Opener hums but won't close door

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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7 Answers from these members:
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 Managemylife.com 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.
by Manage My Life
March 11th, 2012
Answered in 11 hours
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