Most likely, the AED status indicator is not showing a status because the battery has died.
All AED units on the market today perform self-checks to report the operability of the device. If the device “fails” a self-check this will be reported visually and audibly in most cases. If the device is completely out of batteries the AED unit won’t be able to perform a self-check at all and the status indicator will be blank (i.e. there won’t be enough power to indicate that it has failed).
If you notice this with your AED, we recommend that you IMMEDIATELY contact us at (800) 544-0048 and we’ll help assess the status of your AED and offer remediation options to ensure your AED gets back into legal compliance and is fully operational.