Error H6 trouble shooting

Ozark Biomedical may be able to assist. 

Well, to clear the error, press "enter" , "912" , and then "CE" .  The H6 error is issued when the speed read from rotor magnets is 100 rpm more than maximum speed for the rotor.  Just curious, has the cause for the error been determined?  Has any maintenance on the instrument been accomplished prior to the error showing up?  Is the rotor being loaded properly?  Lastly, have the correct settings for the instrument configuration been verified?

Thanks Ben C and TRS i managed to enter "912" then "CE" it cleared  error H6 but when running the centrifuge i was getting error I2. so i suspected there was no communication from the rotor sensor, i cleaned and unplugged it then plugged it back and it worked.