It works fine when its warm, but the colder it gets the less it travels up. If I help lift it will travel all the way up. Sincerely Jerry ps it goes down fine
I called Sears garage door customer service number due to the same issue. The test is to disengage the opener drive by pulling the emergency disengage handle, then open the door half way manually and then let it go. If it stays there it is a door/track/lub problem; if it drops down and closes its a garage door opener problem. Mine stayed open half way during this test so it was a door/track/lub problem. After using silicone spray on all tracks, rollers, and springs mine has been working great. Good luck.........
I had the same problem a few years ago. I adjusted the "Up Force" knob at the back of the unit towards High.
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We too had same problem. I inspected all roller wheels and found one loose and mis-aligned. I re-aligned it and tighted it back up. Also i sprayed the rollers and track with silicone spray. It seem to help. Bud in Az.
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