have exact same problem
My problem is identical to what you described.
Used GE instructions I found inside the electrical box to dismantle unit.
Discovered the problem was the up/down motor. Motor was making noise like it was spinning. Just did not have enough juice to fully turn over and raise the vent. If you gave it a little assist it would work. I have ordered a new motor. It's not too bad to get at once you get it apart.
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