Fans running too fast-6K rpm

I noticed the fans running fast a couple days ago. There does not seem to be a reason of this—temps are low (I think): nothing is reading higher than 46°.
What might be causing this? What should I do about it? Is there a danger aside from burning out the fans?

There are a couple of other things to try:
Open Activity Monitor and see if you have an out of control process. Select "All Processes" at the top and CPU in the bottom bar. Look for something hogging the CPU. Sometimes a printer process will hang up and do this, but it could be almost anything.
Run the extended version of the Apple Hardware Test. It may be that a thermal sensor has failed or become unplugged, and if so, the fans are set to run all out by default.
Burning out the fans is the first danger. Burning out your computer because the fans aren't cooling it is the next danger.
Good luck!

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