USG Flex 700h - Fans/Temp Management

JS87
JS87 Posts: 14  Freshman Member
First Comment Friend Collector Third Anniversary
in USG FLEX H Series

Hey Zyxel Team!

I love my new 700h in my Homelab, but please please adjust the fans.
They are spinning 10sec. normal, then 10sec. high and that on repeat.

My CPU is at 12% and Memory on 59%.

It wouldn't be a problem when it's an high permanently, but that normal/high switch every 10s is a little bit annoying.

But so far it's a great device :)

All Replies

  • Zyxel_Kay
    Zyxel_Kay Posts: 1,103  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - WLAN Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security

    Hi @JS87

    Thank you for your feedback, and we’re pleased to hear you’re enjoying the USG FLEX 700H in your homelab! We’d be happy to take a closer look at the fan behaviour you described.

    Could you please provide us with the following details?

    1. Firmware Version: What firmware version is currently installed on your USG FLEX 700H?
    2. Temperature and Fan Speed: Could you record the temperature and fan speeds during both the normal and high-speed cycles? You can find guidance on checking the CPU temperature and fan status via CLI here:
      How to Check CPU Temperature and Ensure Proper Operating Temperature [USG FLEX H]
    3. Environment Temperature: What’s the approximate ambient temperature in the area where the device is set up?
    4. Video Recording: If possible, could you capture a short video (with sound) showing the fan noise pattern? Please feel free to send it to us via private message for closer review.

    Thanks for helping us with these details! This information will enable us to better understand the behaviour and offer further support.

    Kay

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  • JS87
    JS87 Posts: 14  Freshman Member
    First Comment Friend Collector Third Anniversary
    edited November 8

    Hi Kay!

    Thanks for your reply!
    When I came home after work, I turned on several more devices and the CPU went up to 14% and since then, the fan stays the same :/. So I guess the values don't matter at the moment:

    1. It is the latest V1.30(ABZI.0)
    2. Sensors[0]:45 degress C
      Sensors[1]:40 degress C
      Sensors[2]:54 degress C
      FAN[0]:2592 RPM
      FAN[1]:0 RPM
      FAN[2]:7346 RPM
      FAN[3]:0 RPM
    3. Between 22 and 24 degree Celsius and humidity is at 45%
    4. https://www.youtube.com/watch?v=VVqjhGDgy98

    I'll repeat the steps 1-4, when the fan starts again!

  • JS87
    JS87 Posts: 14  Freshman Member
    First Comment Friend Collector Third Anniversary

    I was able to track it now with the CLI:

    usgflex700h> cmd fan-get
    Sensors[0]:45 degress C
    Sensors[1]:40 degress C
    Sensors[2]:54 degress C
    FAN[0]:2728 RPM
    FAN[1]:0 RPM
    FAN[2]:7769 RPM
    FAN[3]:0 RPM
    usgflex700h> cmd fan-get
    Sensors[0]:46 degress C
    Sensors[1]:40 degress C
    Sensors[2]:55 degress C
    FAN[0]:2597 RPM
    FAN[1]:0 RPM
    FAN[2]:7346 RPM
    FAN[3]:0 RPM
    usgflex700h> cmd fan-get
    Sensors[0]:45 degress C
    Sensors[1]:40 degress C
    Sensors[2]:54 degress C
    FAN[0]:3428 RPM
    FAN[1]:0 RPM
    FAN[2]:7769 RPM
    FAN[3]:0 RPM
    usgflex700h> cmd fan-get
    Sensors[0]:45 degress C
    Sensors[1]:40 degress C
    Sensors[2]:54 degress C
    FAN[0]:2597 RPM
    FAN[1]:0 RPM
    FAN[2]:7346 RPM
    FAN[3]:0 RPM

  • JS87
    JS87 Posts: 14  Freshman Member
    First Comment Friend Collector Third Anniversary
    edited November 8

    Now you can hear it in the YT-video

    At the moment of filming, it were 22°C and still 45% humidity

  • Zyxel_Kay
    Zyxel_Kay Posts: 1,103  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - WLAN Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security
    edited November 11

    Hi @JS87

    Could you please also download the startup-config.conf file from your device and share it with us via private message? We'll review your configuration and attempt to replicate the issue in our lab environment.

    Additionally, we’d appreciate it if you could provide the traffic usage data (throughput, session count, etc.), which you can find on the device's GUI dashboard.

    Kay

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  • Zyxel_Kay
    Zyxel_Kay Posts: 1,103  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - WLAN Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security
    edited November 14

    Hi @JS87

    Thank you for providing the detailed information and remote GUI access.

    We’ve reviewed your device configuration and closely monitored its status during the remote session. Here’s our conclusion: the behaviour of your device is as expected. Since the Sensors[2] is located near the 10G module, the fan RPM will remain high even if traffic levels are not particularly high.

    Regarding the noise occurring every 10 seconds, this is due to changes in fan speed and is normal behaviour, so it’s not a cause for concern.

    Kay

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  • JS87
    JS87 Posts: 14  Freshman Member
    First Comment Friend Collector Third Anniversary
    edited November 14

    Thank you very much!
    But wouldn't it been better, when the next firmware realise there are SFP+ modules active and then prophylactically turns the fans a lil bit more, instead of that switching between some values from real time information?

    At the moment it's switching between 5600 and 5900 which aren't annoying values when they would stay, but that switching every 10s isn't what I expected 🙈

    P.S. I had a new customer today because nobody wanted to manage their old ZyWall 310. We are going to replace it with a Zyxel 500h :)

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