Juniper EX8208 Hardware Manual page 324

If the temperature of FPC 3 exceeds 80° C, a red alarm is triggered to indicate that one or more fans
have failed.
If the temperature of FPC 3 exceeds 105° C, a red alarm is triggered to indicate that the temperature
threshold limit is exceeded.
If the temperature of FPC 3 exceeds 110° C, the switch is powered off.
Table 95 on page 324 lists the possible causes for the switch to generate a temperature alarm and the
respective remedies.
Table 95: Causes and Remedies for Temperature Alarms
Cause
Ambient temperature is above
threshold temperature.
Fan module or fan tray has
failed.
Restricted airflow through the
switch due to insufficient
clearance around the installed
switch.
Remedy
Ensure that the ambient temperature is within the threshold temperature limit. See
"Environmental Requirements and Specifications for EX Series Switches" on page
Check the fan.
Replace the faulty fan module or fan tray.
If the above two checks show no problems, open a support case using the Case
Manager link at https://www.juniper.net/support/
(toll-free within the United States and Canada) or 1-408-745-9500 (from outside
the United States).
Ensure that there is sufficient clearance around the installed switch. See the following
topics to understand the clearance requirements of various EX Series switches.
110.
or call 1-888-314-5822
324