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Troubleshooting the Fan Assembly
Check the following to help isolate a problem with the cooling system:
•
•
•
Note
OL-5093-02
When you start up the system, do the fans start operating?
When the fans are operating, you should be able to hear them. You should also be able to feel air
being drawn in at the bottom front and expelled at the top rear of the chassis.
Check for fan failure by checking the fan status LEDs and running the show environment
1.
command.
Router# show environment
Temperature normal: chassis inlet measured at 29C/84F
Temperature normal: chassis core measured at 42C/107F
Fan:
Power Entry Module 0 type DC status:
Power Entry Module 1 type DC status:
Router#
Ensure that no alarms are triggered on the fan assembly module.
2.
Check if there is sufficient ventilation on the chassis intake and chassis exhaust.
3.
Verify if the ambient temperature is within the specified range.
4.
If the problem persists, see the
section on page
25.
Are the two LEDs —SINGLE FAN FAIL and MULTI FAN FAIL—illuminated (yellow)?
Remove the fan assembly module and reinsert it. If this does not help, examine the LED that is
illuminated, see
"Table 1Fan Assembly LEDs and Their Function" section on page
"Obtaining Documentation and Submitting a Service Request" section on page
Are the following messages displayed?
These messages indicate that the system has detected a critical over-temperature condition or
out-of-tolerance power inside the chassis.
Queued messages:
00:01:19:%ENVM-4-ENVWARN:+2.5 V measured at +2.59
00:01:19:%ENVM-4-ENVWARN:+5.15 V measured at +5.31
00:00:19:%ENVM-2-ENVCRIT:chassis core measured at 31C/87F
00:00:19:%ENVM-2-ENVCRIT:chassis inlet measured at 27C/80F
00:00:19:%ENVM-2-ENVCRIT:chassis outlet 1 measured at 30C/86F
00:00:19:%ENVM-2-ENVCRIT:chassis outlet 2 measured at 30C/86F
Although an over-temperature condition is unlikely at initial startup, ensure that heated exhaust air
from other equipment is not entering the inlet vent of the router and that there is sufficient clearance
around the sides of the chassis to allow cooling air to flow.
The message could also indicate a faulty component or temperature sensor. Use the show
environment or show environment table command to display the internal chassis environment.
"Obtaining Documentation and Submitting a Service Request"
Cisco uBR10012 Universal Broadband Router Fan Assembly Module
Troubleshooting the Fan Assembly
OK
OK
OK
3. Else see,
25.
23
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