Troubleshooting | NS Gen 2 switch fan speed goes high and does not provide PoE to attached devices

Learn how to diagnose and fix a NS Gen 2 switch fan speed, which is excessively high and stopping PoE output.

Updated at July 20th, 2023

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Table of Contents

Affected Products

Hardware Model/Series NS Gen 2 switches
Software firmware V4.0.4.9 (REV F)
  • Units built with firmware REV F, date code range: Dec 20, 2022 to May 23, 2023 (2249 to 2315)


A batch of NS Gen 2 switches produced with firmware V4.0.4.9 (REV F) experience issues with the fan speed increasing to high while PoE output does not function.

Solution | Workaround

This issue is recoverable by installing Netgear firmware V4.0.4.13 (REV G) using the steps below.

  1. Downgrade the switch firmware to version
  2. Reboot and verify if issue is resolved.
  3. Upgrade firmware to version and reboot.


    • It may be necessary to reload firmware and reboot the switch multiple times.
    • If the issue persists, Netgear requests the tech-support file and will typically provide options for RMA.