How to label a light that means "This Release Valve is working properly"?

FYI, this is for a very short story called Human Error (5 min read)

UPDATE (constraints):

  1. I only have control over the label.
  2. It's a plain old printed label on a physical control panel. You can completely replace the existing printed label with your own. (This is for a sci fi story about UX. The character can only modify the label)
  3. Label should be 4 words (35 characters) or less. Shorter is better.

How would you label an indicator light so it conveys:

"This valve is working properly"

So that if the light went out its obvious the valve was not working properly.

RELEASE VALVE ______

  • Working
  • Nominal
  • Power
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