Juniper EX2300 Series Hardware Manual page 260

• If the temperature of FPC 3 exceeds 55° C, the output indicates that the fans are operating at a high
speed (no alarm is triggered).
• If the temperature of FPC 3 exceeds 65° C, a yellow alarm is triggered to indicate that one or more
fans have failed.
• If the temperature of FPC 3 exceeds 75° C, a yellow alarm is triggered to indicate that the temperature
threshold limit is exceeded.
• 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 63 on page 251 lists the possible causes for the switch to generate a temperature alarm and the
respective remedies.
Table 63: 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 55.
•
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/
1-888-314-5822 (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.
or call
251