You'd think they'd at least say buy with confidence it comes with detailed instructions enabling you or any competent tech to install with confidence.
Instead, I figured it out and fixed it all by myself. Which is what you should do.
Sounds like if you can fix the control board you can get it working. Or, since the motor works, then find another control board. A hassle to be sure. But in the end you wind up knowing how the darn thing works, able to fix just about anything, and probably along the way learn enough to replace whatever is broken with better parts in other words it winds up being an upgrade.
Then live and learn, next time buy American. After enough similar experience with lousy customer service from foreign manufacturers (China by far the worst!) its what I'm doing.