Cisco ASR 1000 Series - Troubleshooting the Cooling Subsystem

C-5
Cisco ASR 1000 Series Aggregation Services Routers Hardware Installation Guide
OL-13208-11
Appendix C Troubleshooting Initial Startup Problems
General Troubleshooting Tips
Troubleshooting the Cooling Subsystem
Use the information in Table C-3 to isolate problems with the cooling subsystem.
System powers off,
no STATUS LED,
and no operating
fans.
Power supply failure. **If the system is operating with only one
power supply, it powers off after five
minutes.
**Except for the Cisco ASR 1001 Router, four power supplies must be installed in the chassis at all times, with a minimum of
two power supplies (one per zone) connected to the mains in order to power on the system and ensure sufficient cooling.
The system fans are inside the power supply units and must spin for cooling. Because all the system fans can be powered
by one power supply, the second power supply unit does not have to be powered on, but must be connected. If you remove
a power supply from a system that has four power supplies that are connected and powered on, the system can run only for
a maximum of five minutes before shutting down. However, because the fans and power elements are independent within
the power supply, the replacement power supply does not have to be energized within five minutes. The only requirement
is that the power supply be installed in the chassis in order to energize the fans and maintain proper system cooling.
Table C-2 Troubleshooting the Power System (continued)
Symptom Possible Cause Possible Solution
Table C-3 Troubleshooting the Cooling Subsystem
Symptom Possible Cause Possible Solution
System shuts down, some fans may or may
not continue to rotate, and this error
message is displayed:
Queued messages:
%ENVM-1-SHUTDOWN: Environmental
Monitor initiated shutdown
This error message indicates that the system
has detected an overtemperature condition
or out-of-tolerance power condition inside
the chassis.
• One or more fans are not
operating.
• The fans are operating too
slowly.
• The power supply is not
operating.
To determine if the fans are
operating, listen for them. In noisy
environments, place your hand on the
rear of the chassis to feel if air is
being forced out the vents.
Contact a service
representative.
Multiple fan failure Fan speed dropped below the fan fail
speed.
• Identify and
log the failed
fan PEM
location.
• Replace the
PEM.
Heated exhaust air from other
equipment is entering the routers
inlet vents.
Move other
equipment or the
router to ensure
proper airflow.