EXFO FG-750 - Manual (Page 307)

Troubleshooting
Fiber Guardian 293
Refreshing the Status of the LEDs
Refreshing the Status of the LEDs
When power or system errors occur, the corresponding LED switches from
green to another color, depending on the type of problem that has been
detected (see LED Indicators Description on page 286). For troubleshooting
purposes, the status of the LEDs is kept until you refresh it.
You can refresh the status of the power or system LEDs using one of the
following methods:

Send a request to refresh the status, via the Fiber Guardian Web user
interface, or by using the LedStateChangeRequest REST command.
This method is particularly useful when you do not need to turn off the
unit (for example, after you corrected software errors).
For more information on the REST commands, see Working with the
REST Commands (Certain Models Only) on page 79.

Shut down and restart the unit. For more information, see Turning On
or Off the Unit on page 48.
Normally, you will only need to refresh the status of the LEDs in the case of
software errors. For hardware errors that require a replacement of material
(power supply, fan, filter), the status will be refreshed automatically after
you restart your unit.