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garage door opener rattles and opens only slightly - seems to be stuck

my garage door opener (sears 139.53975SRT1) 1/2HP just started vibrating as it opens. it tries to open then gets stuck at about 10" off the ground and stays rattling until I press the open/close button on the remote again. It does this regardless of which remote I use (wireless, or the main pannel).

when I release the handle, the chain moves freely all the way to the close/open position. I tried adjusting the up force but it didn't help.

Any ideas as to what the problem is would be appreciated.


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1 Answer from this member:
Manage My Life
by Manage My Life
March 11th, 2010
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