Per the topic sentence, (1) How can I control the “heat sync” fan running Home Assistant OS? One of the two GPIO fans have suddenly gotten very loud, and when checking it out I see that the “heat sync” fan doesn’t appear to pe running at all. And (2) One of the two GPIO fans is suddenly very loud. What can cause this, can it be fixed, or does it need to be replaced? If so, how? I purchased the case on November 11, 2025, just six months ago. Please advise. Thank you.
Thank you for your message.To clarify, are both fans not working according to the set mode?
Is one of them no longer spinning, and the other very loud?
Could you please send us a short video showing the behavior of both fans? If the video is large, please upload it to a cloud service (such as Google Drive, OneDrive, or Dropbox) and share the link with us.Thank you for your cooperation.
I control the cpu fan in config.txt:
dtparam=fan_temp0=35000
dtparam=fan_temp0_hyst=5000
dtparam=fan_temp0_speed=150