My ys640 fan makes a howling noise for the first several minutes when it's cool out. (Hasn't got to freezing yet tho...)
Anybody else? Or is mine on the way out?
If it clears up after a few minutes, it is fine. If it never clears up, then send us an email. If you want to but a spare, send us an email. Warranty is 3 years on the fans.
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