NETGEAR is aware of an issue with a constant Red Health LED on the ReadyNAS 3220/4220 chassis.
In order to properly identify this specific issue as the one you're experiencing, you must meet the following criteria:
- At least one PSU is connected to a UPS.
- The UPS runs a self-test.
How does this issue occur?
- UPS devices run a self-test to maintain health.
- When the UPS runs self-test, the UPS will interrupt power to connected devices for 2-4 milliseconds.
- The self-test interrupting power for 2-4 ms is an industry standard.
- The ReadyNAS 3220/4220 PSUs detect that loss of power and turn on the health LED.
- The health LED will only turn off if the system is restarted.
- The health LED will reactivate once the UPS sends the power interrupt.
What can I do about the health LED when connected to UPS?
- The Health LED will either be turned on by the operating system (software) or from the power supplies (hardware)
- Please ensure you are not receiving e-mail alerts from the ReadyNAS and confirm in the web interface about the health of the device.
- Software triggered events should turn off the LED after being resolved.
- Do not only rely on Health LED to inform you of the health of your device.
- Cover the Health LED
- Some instructions are provided on how to modify the PSU Alert wire interally to the device. Doing so is at your own risk and is only recommended for advanced users.
Last Updated:10/17/2025
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Article ID: 27481