Recognize an Over-Temperature Condition
An overtemperature condition occurs, for one of two reasons: the card genuinely is too hot or a sensor
has malfunctioned.
Inspect cards adjacent to the one reporting the condition to discover the cause.
• If directly adjacent cards are not normal temperature, suspect a genuine overheating condition.
• If directly adjacent cards are normal temperature, suspect a faulty sensor.
When the system detects a genuine over-temperature condition, it powers off the card. To recognize this
condition, look for the following system messages:
CHMGR-2-MAJOR_TEMP: Major alarm: chassis temperature high (temperature reaches
or exceeds threshold of
[value]C)
CHMGR-2-TEMP_SHUTDOWN_WARN: WARNING! temperature is [value]C; approaching
shutdown threshold of [value]C
To view the programmed alarm thresholds levels, including the shutdown value, use the show alarms
threshold command.
Example of the show alarms threshold Command
Dell#show alarms threshold
-- Temperature Limits (deg C) --
---------------------------------------------------------------------------
BelowNormal Normal Elevated Critical Trip/Shutdown
Unit0 <=40 41 71 81 86
Dell#
Troubleshoot an Over-Temperature Condition
To troubleshoot an over-temperature condition, use the following information.
1. Use the show environment commands to monitor the temperature levels.
2. Check air flow through the system. Ensure that the air ducts are clean and that all fans are working
correctly.
3. After the software has determined that the temperature levels are within normal limits, you can re-
power the card safely. To bring back the line card online, use the power-on command in EXEC
mode.
In addition, Dell Networking requires that you install blanks in all slots without a line card to control
airflow for adequate system cooling.
NOTE: Exercise care when removing a card; if it has exceeded the major or shutdown thresholds,
the card could be hot to the touch.
Example of the show enivornment Command
Dell#show environment
-- Unit Environment Status --
Unit Status Temp Voltage
----------------------------
* 0 online 71C ok
Debugging and Diagnostics 303