Hello,
I have the same problem as Porto: one of the potentiometers on my Kaze Master only works at full speed. This is quite strange, and the problem has somehow worsened on the course of a few days. At first, suddenly, one of my fans stopped running, so the Kaze Master started to beep (it's really a great product by the way). So I turned the button up, and the fan started running again. I turned the button down again to adjust the speed so the fan was quiet, and everything was fine.
Later (maybe a few hours later or the next day), same problem. But this time, I couldn't turn down the potentiomenter. As soon as I turned it down even slightly, the fan would stop running.
Thinking it might be a problem with the fan, I tried to connect it to another channel of the Kaze Master. It worked with no problem. Then, since obvioulsy it was a problem withn the Kaze Master itself, I shipped it to my reseller. Before that, the Kaze Master worked flawlessly, for 8 months.
Unfortunately, they told me they could not reproduce this problem... They're still looking at it, but it looks like they're going to ship it back to me (and I'll have to pay extra, since their policy is to make you pay the postage when they send back a non-defective product, oh well). So I came here to see if anyone had encountered the same problem, if it's a known problem or not, is there a work-around, etc.
Maybe it's just the potentiometer which is somehow broken, and during the shipping to the reseller it got more or less back intoplace, so it works again. Until it moves again or something like. However, the Kaze Master hasn't moved for 8 months, it was sitting securely in my PC, which doesn't move (it's a huge beast, so...); so I don't think it's this kind of problem. But who knows.
I would like to add the following info: in fact I was powering 3 fans and not 1 on the defective channel (it's a watercooling radiator with 3 120mm fans, Noctua NF-P12, rated at 1.08 Watts, so for 3 it means 3.24 Watts, which is clearly under the maximum 12 Watts per channel of the Kaze Master (unless I'm wrong).
I did not check the voltage, that's a good idea, unfortunately I don't have the Kaze Master now. When they ship it back to me, I'll certainly do that.
Thanks in advance for any help on this matter
and sorry for the long message...