AC automatically defaults to defrost and air speed cannot be controlled

When trying to turn off the AC automatically defaults to defrost and airspeed cannot be controlled. Started to run a diagnostics and when it started the fan indicator light turns on and keeps going up after about ten to fifteen seconds all the lights everything on the display turn on, at the point when I exit defrost automatically start blowing again.

All functions work on the unit just can’t turn off or it will default to defrost or can’t adjust air speed.