Thermal Alarm; Troubleshooting (5U Enclosures) - Lenovo Storage D1212 Hardware Installation And Maintenance Manual

Symptom
If the ambient air is below
25 °C and the fans are
observed to increase in
speed, then some
restriction on airflow may
be causing additional
internal temperature rise.
Note: This is not a fault
condition.

Thermal Alarm

Symptom
1. Ops panel module
fault LED is amber.
2. Fan fail LED is lit on
one or more PCMs.

Troubleshooting (5U Enclosures)

The following sections describe common problems which can occur with your enclosure system and some
possible solutions. For all of the problems listed in Table 20 "Alarm Conditions " on page 64, the module fault
LED on the Ops panel (Figure 26 "PSU LEDs" on page 23) will light amber to indicate a fault. All alarms will
also report via SES.
Table 20. Alarm Conditions
Status
PSU alert – loss of DC power from a single PSU
Cooling module fan failure
ESM detected PSU fault
PSU removed
Enclosure configuration error (VPD)
Low warning temperature alert
High warning temperature alert
64
Lenovo Storage D1212/D1224/D3284Hardware Installation and Maintenance Guide
Cause
The first stage in the thermal control
process is for the fans to
automatically increase in speed
when a thermal threshold is
reached. This may be caused by
higher ambient temperatures in the
local environment and may be
perfectly normal.
Note: This threshold changes
according to the number of drives
and power supplies fitted.
Cause
The internal temperature has
exceeded a pre-set threshold.
Action
1. Check the installation for any airflow
restrictions at either the front or rear of the
enclosure. A minimum gap of 25 mm at the
front and 50 mm at the rear is recommended.
2. Check for restrictions due to dust buildup.
Clean as appropriate.
3. Check for excessive recirculation of heated air
from rear to the front. Use of the enclosure in a
fully enclosed rack is not recommended.
4. Check that all blank modules are in place.
5. Reduce the ambient temperature.
Action
1. Check that the local ambient environment
temperature is below the specification (see
"Environment" on page 113).
2. Check the installation for any airflow restrictions at
either the front or rear of the enclosure. A minimum
gap of 25 mm at the front and 50 mm at the rear is
recommended.
3. Check for restrictions due to dust buildup. Clean as
appropriate.
4. Check for excessive recirculation of heated air from
rear to the front. Use of the enclosure in a fully
enclosed rack is not recommended.
5. If possible, shut down the enclosure and investigate
the problem before continuing.
Severity
Fault – loss of redundancy
Fault – loss of redundancy
Fault
Configuration error
Fault – critical
Warning
Warning