I believe you have a Duplomatic BSA 200 turret. The Turret Thermal alarm is a generic alarm that pops up when the turret is having issues. It can lead you to believe there is a motor problem. Since you can spin it by hand,it has not locked the curvex coupling inside. You can try to get it to lock by holding in the shift button on the lower key panel while pushing the tool disc rotation button. Try this after hitting the E-stop and re-energizing. You may have to try both directions and also. There is a way to do it with the cover off if needed.
You can contact Macoser Metal for a manual. Good luck