IMac Loud Fan: getting error 4SNS/1/40000000:TCOH

My BRAND NEW imac 20" has been making all sorts of noise. The fan revs up to full rpm and doesn't quit until I restart and zap the pram. After runnin some the hardware diagnosing app i get the following error:
4SNS/1/40000000:TCOH
What the heck is that?

Your computer has to start from the Windows disc but it's not doing this. After creating the volume, make sure that the Windows disc is inserted, and turn on your Mac holding the Option (Alt) key, so you will see all bootable partitions. Choose the "Windows" option with a DVD, so the Windows installer will start and you must follow its steps.
If you need help installing Windows, follow the steps of this how-to > http://manuals.info.apple.com/en_US/boot_camp_install-setup_10.8.pdf

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    Genius Bar Reservations

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    The fan in the MBP will run high as a default if the sensor has failed (6200 rpm).  Did you tell the technician about the AHT error message?  Did he take any corrective action or tell you specifically what options there were to rectify the situation?
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    Hi,
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    Only Apple really knows. Sensor for some type.
    What are you using to monitor thermal sensors and the rest of the system?
    Download Temperature Montor
    Schedule or take it in for a free checkup.
    You can google to find the Apple Service Diagnostic CD.
    Your Mac is 4 yrs old so likely out of AppleCare?
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    All the fans run constantly. But if the fans are very loud you should get the unit replaced while still within the 14 days from purchase.

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