Vertiv Liebert CRV - Page 129

PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Digital Scroll Sensor
Failure
Sensor disconnected
Verify sensor reading in User Menu, Sensor Data.
Check plug connections
Contact your local Vertiv™ representative
Low Supply
Temperature Alarm/
Room Over-cooling
Low return temperature Place a unit into standby (if applicable)
Poor airflow
Install blanking panels in open areas of racks. Consult your local Vertiv™ representative.
Direct discharge baffles to heat source
Supply chilled water
temperature too low.
Check cooling water temperature
Low Room
Humidity
Humidifier Suspended
message.
See Humidification in the “Liebert® iCOM™ User Manual” included with your system documentation.
Humidifier problem
alarm.
Check fault LED on humidifier PCB enclosure.
See Humidifier Troubleshooting on page87
Room Humidity
Problem
Room humidity has exceeded the humidity control band for 36 hours straight. Verify setpoints and
confirm room is properly sealed.
High Room
Humidity
Dehum Suspended
message
The operated in dehumidification for excessive time. Dehumidification is suspended to prevent
condensation for forming on accent panels and other areas.
Room Humidity
Problem
Room humidity has been below the humidity control band for 36 hours straight. Verify setpoints and
confirm room is properly sealed.
Unit fan fails to start
Fan is faulty Contact your local Vertiv™ representative
Top or Bottom Fan
Failure Alarm
Confirm rear door switches are made
Confirm fan contactor is pulled in
Confirm line voltage is present at the fan
Contact your local Vertiv™ representative
Water drops carried
by airflow
Room humidity is over
acceptable limit
Check room condition
Condensate pan drain
is clogged
Contact your local Vertiv™ representative
Problem with humidifier
control
Contact your local Vertiv™ representative
Table 12.1 Unit diagnostics (continued)
Vertiv | Liebert CRV Installer/User Guide | 129