Craftsman garage opener does not work, just hums

mrhsuehJune 25, 2011

I have a Craftsman (1/2 hp) about 6 years old. It just stopped opening the garage door. I released the release latch and pressed the remote, it moved to open position. But, after that, everytime I press the remote button, it just hums. I checked the chain and it does not jam. I also checked the plastic white gear. It looks like new. I removed the chain and pressed the button, the motor does not run and it just hums. I do not know what else I should check before I go to buy a new opener. Thank you.

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The start capacitor can cause the problem you describe.

    Bookmark   June 27, 2011 at 9:34AM
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Thanks, don_1_2006.

After I replaced the start capacitor, the motor starts working. But I still cannot close the garage door. Everytime I pressed the remote button, it moves down several inches and then back to the open position. Any suggestion?

    Bookmark   July 1, 2011 at 9:43PM
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If the main light is flashing 10 times when the door reverses it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering.

If this isn't the case, increase the down force just a little and try. This adjustment is on the rear of the motor unit near where all those white wires go.

    Bookmark   July 5, 2011 at 10:20AM
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Thanks, Don.

After I increased the down force and it works fine now. You are a life saver.

    Bookmark   July 7, 2011 at 11:23PM
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