It does not seem like the motherboard is sensing the fan s properly.
Dell optiplex cpu fan error.
Turn off the pc.
Air vents may be located in various places depending on the pc model.
If you have an optiplex stating its model number and size speeds troubleshooting.
We ve swapped the cpu fan and the front case fan from other working optiplex 3010 s and the message still appears.
Dell optiplex 755 removing cpu fan i would like to suggest you please don t go yourself to check that because it may harm the system if any wrong thing happens.
Use a can of compressed air to remove dust or debris from the air vents dust filters if any and cooling fan fins.
Refer to the user manual of your dell pc.
Better you go to the dell service center with your purchase bill.
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I m a big fan of dell a dell user and not an employee.
Check the air vents on the pc for dust or debris.
All of the fans inside the system are running normally.
New optiplex 390 fan failure message we believe it is a sensor error.
This forum is mainly user to user with occasional moderation or additional knowledge by a rockstar or dell employee.
Cleaning the air vents on your dell pc.