In most cases there is no way to tell, especially with torsion springs. They normally do not show any visible signs of wear.
They are kind of like light bulbs in that regard. One time you hit the button and “pop”. When that happens you’ll have to schedule a repair call to replace the spring.
With extension or “stretch” springs, they will sometimes show sign of weakening when the coils stretch unevenly.
If you need help in the Greater Cincinnati – Northern Kentucky area, give us a call at (513) 821-5095.