Hello Everyone!
I recently crashed my Mavic into a wall and fell to a concrete surface. No apparent damage to drone. When I started it up I got an error message: Forward vision sensor .calibration error.
Then I noticed it was extremely HOT! Tried to calibrate with the DJI assistant. It recognized the mavic but Failed any attempt to calibrate.
Fearing damaging I  turned off the drone! Any advice on what to do next?

Contact DJI.

I think you need to start RMA.

Did you hear the internal fan running? Sounds like that has been damaged and along with the vision sensors. Maybe the forward facing sensors are just dirty - try cleaning them. But as others have mentioned, for safety's sake you should get it at least evaluated, and ultimately repaired. Walls and concrete floors are not a quad-copter's friend.

If you dare, you could open it and see if the fan got disconnected or something made it get stuck.

Thank you all for your input!
Think I will send it in to DJI service.
We'll see how that goes!?!?!?!

It's best to send it in for evaluation (do you have Refresh) ?
Here is the link to get started, and sorry fro your crash.
https://repair.dji.com/en/SelfRepair/Area