Hardware test Alert Code: "4MOT/4/40000003:HDD-1229" on 2011 27'' i7 iMac. HELP

Hello,
last week I found out that some files on my mac were missing so I desided to do an hardware test.
when the test finished I got the following alert:
"4MOT/4/40000003:HDD-1229"
What does it mean?
Thank you,
Aviad

The hard disk fan sensor is damaged. Make a backup of your files and take the computer to an Apple Store or reseller to have your hard disk replaced.
It's possible that Apple reinstalls the Mac OS X version you have onto the new hard disk, so you just have to make a Time Machine backup and restore it during the initial setup of your computer. Also, if Apple installs a blank hard drive, you can use Internet Recovery to restore your Time Machine backup > http://support.apple.com/kb/HT4718

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