[DavisC]

I found this for the FRC-cRIO 1 by doing a google search, the FRC II docs is on the NI Community

STATUS LED
The STATUS LED is off during normal operation. The cRIO-FRC
indicates specific error conditions by flashing the STATUS LED a certain
number of times as shown in Table 3.

USER1 LED
You can define the USER1 LED to meet the needs of your application. To
define the LED, use the RT LEDs VI in LabVIEW. For more information
about the RT LEDs VI, refer to the LabVIEW Help.

Table 3. Status LED Indications
Number of Flashes Indication

1 The chassis is unconfigured. Use MAX to configure the chassis. Refer
to the Measurement & Automation Explorer Help for information about
configuring the chassis.

2 The chassis has detected an error in its software. This usually occurs
when an attempt to upgrade the software is interrupted. Reinstall
software on the chassis. Refer to the Measurement & Automation
Explorer Help for information about installing software on the chassis.

3 The chassis is in safe mode because the SAFE MODE DIP switch is in
the ON position. Refer to the Configuring DIP Switches section for
information about the Safe Mode DIP switch.

4 The software has crashed twice without rebooting or cycling power
between crashes. This usually occurs when the chassis runs out of
memory. Review your RT VI and check the memory usage. Modify
the VI as necessary to solve the memory usage issue.

Continuous flashing or solid
The device may be configured for DHCP but unable to get an IP address
because of a problem with the DHCP server. Check the network
connection and try again. If the problem persists, contact National
Instruments.

http://www.bu.edu/bufirst/files/2011/01/cRIO_Manual.pdf