SECONDARY ERROR CODES
The specific type of hardware failure can be determined by a “hidden” error code

  • Turn the Xbox 360 on, and wait till the 3 red lights are flashing.
  • Press and hold the sync up button (the small white one), while holding that button press the eject button.
  • The LED’s will now blink the first number in the code (as described below).
  • Release the eject button and press it again.
  • The LED’s will now blink the second number of the code.
  • Release the eject button and press it again.
  • The LED’s will now blink the third number of the code.
  • Release the eject button and press it again.
  • The LED’s will now blink the forth number of the code.
  • Release the eject button and press it again.
  • The LED’s will go back to the 3 red flashing lights.

You should be able to determine the difference between the 3 flashing lights and the error code lights by the rate in which they flash.

Here is how you interpret the LED’s to get the code number:

  • All four lights flashing – 0
  • One light flashing – 1
  • Two Lights flashing – 2
  • Three lights flashing – 3

For example, 0102 would be

4 flashing red lights, 1 flashing red light, 4 flashing red lights, 2 flashing red lights

All credits for this go to twistedsymphony over at Xbox-scene.com
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