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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