Troubleshooting Shelves
SH7HU(-R) Fan Status LEDs
There is one LED named “fan”, which indicates the operating status of the fan unit. This LED always shows the
failure with the highest severity. If the LED is lit green, the fans are working properly. If the LED is lit yellow, red,
or is off, one or more fans are faulty.
It is recommended to have a replacement fan unit available at all times.
If a fan malfunctions or fails, Service Personnel must replace the fan unit within 48 hours after failure. To
restore system cooling, ensure that the replacement procedure does not exceed 3 minutes! To replace a fan
unit, refer to “Replacing a FAN/Plug-In” on p.737.
LED
Names
LED Colors Potential Cause Solution for Troubleshooting
Fan Red Firmware Mismatch
or
More than one fan has failed.
Fan speed has deviated by
30% from the target speed or
has failed.
Check if a firmware mismatch is displayed in
the management and update the firmware if
available.
• If no firmware mismatch is displayed in
the management, a hardware mismatch
has occurred. Remove the fan unit and
reinsert it again.
• If the LED of the fan unit still lights up
red, have Service Personnel replace the
fan unit and return it to ADVA Optical
Networking.
Yellow One fan has failed. Fan speed
has deviated by 30% from the
target speed or has failed.
No action is required.
Yellow
blinking to off
Firmware / Hardware Mismatch
or
Communication is broken
between FCU and SCU.
1 Check if a firmware mismatch is
displayed in the management and update
the firmware if available. If no firmware
mismatch is displayed in the
management, a hardware mismatch of
the fan unit or SCU has occurred.
2 First remove and reinsert the fan unit. If
the LED is blinking yellow to off, remove
and reinsert the SCU.
• If the LED is still blinking yellow to off,
have Service Personnel replace the fan
unit and SCU.
• If the LED is still blinking yellow to off,
contact your ADVA Optical Networking
Technical Services Representative.
Green All fans are operating properly. No action is required.
Table 9: SH7HU(-R) Fan Unit LED Status
76 FSP 3000R7 Maintenance and Troubleshooting Manual - Product Release 16.2 - Document Issue A
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