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8500 installed less than 2 months will not open garage door.

I have an 8500, installed less than a month. When I hit the button on remote or main control panel the only thing that happens is it unlocks the door. To open I have to disconnect the unit and manually lift the door. After it is open I then reconnect the door and hit the remote or main control and it will close. After it is closed though it will not lock the door. I have to manually lock the door.
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