Series S Fan Behavior - Slow and Steady or Ramp Up with Load?

My One S does about the same. The fan just decides to ramp up to 100% without the unit being warm. I'm on here now because I've coped with it since I can get it to go months without ramping up but now I am out of warranty. I decided to move it to my
living room recently where I like to open my windows for cool air. And as soon as I do so the fan ramps up to 100%. Every time it gets hit by cool air it must think it's over heating. Annoying thing is, once the fan kicks it into over drive, the fan won't
slow down on its own most of the time and will spin at 100% even after I turn the unit off or even hours later if I let it. Hopefully I can find some answers somewhere on here before I tear the thing apart.

Hi, Devrie! thank you for reaching out.
I'm AJ, an Independent Advisor for the Xbox Community.
I'm sorry to hear you are experiencing issues with your console.

If you don't mind, I'd appreciate it if your could answer the following questions:

- May I ask which Xbox model you are using?
- Are there any devices plugged into your console's USB ports?
- Is your console plugged directly into one of the wall's outlets? in some cases, power strips and extension cords can cause power-related issues.

Thank you! I'll be looking forward to your reply.
Best regards.

Mine does it too. I posted about it in the preview program section and an MS dev said that it was normal. I also spoke to another dev via PM on Reddit and he also said that it was normal.

It seems like the fan profile is designed to keep the One X's fan spinning as slow as possible as often as possible, so rather than it slowly ramping up as the load does, you get these occasional spikes instead.

There will likely be some variance in terms of the silicon lottery and the way the thermal paste has been applied, plus there will be a lot of people whose console's fan does actually ramp up, but because of the distance they sit from the TV, their sensitivity
to hearing fan noise, and how loud they have the game volume turned up, they don't notice it.

MS do track telemetry, which includes the way the fans spin up, so there is a possibility that they'll change the fan profile in a future system update, but given that I've had 2 MS devs tell me that it's normal, I'm not going to risk doing an exchange.
Chances are that a replacement console would do the exact same thing, but I might even end up with one that's worse, or that is actually faulty.

Hello,

I only hear the fans ramp up 2 times when I had to load up a HoloTapes in to a Terminal it was extremely laggy so I put non Quest Tapes in the stash.

But all in all it seems to have been fine.

I believe there is an update today so it might help with some bugs

http://www.youtube.com/watch?v=bhz9eTcL1h0&feature=player_embedded

this explains how banning works. To sum up. It is slow but steady.