User guide

Troubleshooting
55
4.5.4 Thermal Alarm
Symptom Cause Action
1 Ops Panel SYSTEM
FAULT LED AMBER.
2 An AMBER LED on
one or more Power
Supply module.
3 Audible Alarm
Sounding.
4 Air temperature
exiting PSU above
55°C.
1 If the internal temperature
measured in the airflow
through the enclosure
exceeds a pre-set
threshold a thermal alarm
will sound.
2 Cooling Module failure
1 Check local ambient environment
temperature is below the upper 40°C
specification.
2 Check the installation for any airflow
restrictions at either the front or rear
of the enclosure. A minimum gap of
25mm at the front and 50mm at the
rear is recommended.
3 Check for restrictions due to dust
build-up, clean as appropriate.
4 Check for excessive re-circulation of
heated air from rear to the front. Use
in a fully enclosed rack installation is
not recommended.
5 If possible shutdown the enclosure
and investigate the problem before
continuing.
6 Replace Cooling Module
4.5.5 Thermal Warnings
Symptom Cause Action
1 ALL AMBER LEDs
on the Ops Panel
and on ALL drive
bays illuminated
flash.
2 Audible Alarm
sounds almost
continuously and
cannot be muted.
At a higher threshold than the
Thermal Alarm (this should
already have been activated).
OR - All fans have failed.
OR - Only 1 fan operating and
the internal temperature is 40° C
or above.
1 Switch Off immediately.
2 Check for airflow restrictions.
3 Check Power Supply module faults.
4 Check for excessive local
temperatures.