opens and stops in the same spot every time

RE: Overhead garage door opener Model 990 (screw drive)

I have a garage door opener that when activated, always stops in a certain spot and won't open up any higher.

What do you think is the problem?

And is there an online manual somewhere?

no, there is no online some where for it.....

You can find a manual here

It sounds like the open limit needs adjusted....

In your situation, I would recommend you to get your garage door repaired by taking help of professional garage door company.
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Garage Doors Repairs

Okay, based on the issue you're describing with your garage door opener stopping at a certain spot and not opening any higher, there are a few potential problems that could be causing this:

Limit switch issue: The limit switches on the opener are what tell it when to stop opening and closing the door. If one of the limit switches is improperly adjusted or malfunctioning, it could be causing the door to stop prematurely.
Force adjustment problem: Similar to the previous issue you mentioned, if the force settings are not properly calibrated, the opener may not have enough power to fully open the door.
Mechanical obstruction: There could be something physically obstructing the full travel of the door, like damaged rollers, bent track, or an issue with the torsion springs/cables.
To troubleshoot this further, I'd recommend checking the owner's manual for your specific garage door opener model. Many manufacturers provide online versions of their manuals that you can reference.

If possible, we are happy to provide online guidance and help, you can contact us: CHI Hardware Co., Ltd.

Or you can directly send us an email about your problem, and we will reply to you as soon as possible after seeing it.
Email: chi@chihw.com