Troubleshooting The Cooling Subsystem - Cisco 7401ASR Installation And Configuration Manual

Chapter 5 Troubleshooting

Troubleshooting the Cooling Subsystem

Check the following to help isolate a problem with the cooling subsystem:
Table 5-2 Troubleshooting the Cooling Subsystem
Symptom
System displays the following message:
Router: 00:03:46:%ENVM-3-BLOWER:Fan 2 may have
failed
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.
System shuts down 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.
The system fans may continue to operate
Note
although the system shuts down.
OL-5419-01 B0
Possible Cause
One or more fans are not operating.
• 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.
Heated exhaust air from other equipment is
entering the router's inlet vents.
The error message could indicate a faulty
component or temperature sensor. Before the
system shuts down, use the show
environment or show environment table
command to display the internal chassis
environment. See Chapter 3, "Starting and
Configuring," the "Reporting Functions"
section on page 3-5 for descriptions of the
show environment and show environment
table commands.
If an environmental shutdown results from an
out-of-tolerance power condition, the system
shuts down.
Cisco 7401ASR Installation and Configuration Guide
Problem Solving Using a Subsystems Approach
Possible Solution
Contact a service
representative.
Contact a service
representative.
Move other
equipment or the
router to ensure
proper airflow.
Contact a service
representative.
If the system still fails
to come up when the
power supply is
connected to a
different power
source with a new
power cable, the
power supply is
probably faulty.
Contact a service
representative.
5-5