Cisco uBR10012 Troubleshooting Manual page 27

Chapter 2 PEM Faults and Fan Assembly Failures
Table 2-6
Symptom
Fans OK LED is not lit
SINGLE FAN FAILURE
LED is lit
MULTI-FAN FAILURE LED
is lit
Fans run but the system
overheats
OL-1237-01
Fan Assembly Module Fault Indications and Recommended Action
Steps to Take
Make sure the fan assembly module is fully inserted into the chassis.
1.
Place your hand in front of the fan assembly module outlet to determine if the fans are
2.
operating. If the fans are running, remove the fan assembly module and inspect the wiring
to the LEDs and fans to ensure that the wires are not nicked or cut.
Make sure that two AC PEM or two DC PEM modules are installed in the chassis.
3.
Although only one PEM is required to power the chassis, two PEMs should be installed
for proper airflow. (If one PEM fails, leave the failed module in the chassis until the
replacement module can be installed.)
If you use DC PEMs, make sure the wiring is not reversed.
4.
Replace the fan assembly module.
5.
One fan in the fan assembly module has failed. The fan assembly can cool the chassis
sufficiently with three working fans, but replace the failed fan as soon as possible.
More than one fan has failed, and the fan assembly cannot sufficiently cool the chassis.
Replace the failed fans immediately. If necessary, power down the chassis until replacements
are available.
Make sure that all intake and exhaust vents on the front and rear of the chassis are free
1.
of blockages.
Make sure that the ambient temperature and other environmental factors in the system
2.
area are within the ranges specified in the
Information" section on page
Make sure all line cards and blank faceplates are in place. Make sure two PEM modules
3.
are installed in the chassis. The cooling system cannot operate effectively unless the
chassis is fully enclosed.
Check the air filter, and, if necessary, clean or replace it.
4.
Reduce the ambient temperature of the area surrounding the Cisco uBR10012 chassis.
5.
This can be done using air conditioning, using fans to circulate the air in the room, and
closing the blinds on any windows that are facing the sun.
"Displaying System Environment
1-4.
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Fan Assembly Module Faults
2-9