Please be environmentally responsible and recycle this product through your recycling facility at its end of life.
Do not dispose of this product as unsorted municipal waste. Follow local municipal waste ordinances for proper
disposal provisions to reduce the environmental impact of waste electrical and electronic equipment (WEEE).
The machine has been designed and built to ensure continuous operation. The working life of some of the main components,
such as the fan and the compressor, depends on the operating condition and maintenance that they receive.
9.11 Troubleshooting
The following table lists possible issues and their cause and corrective steps.
Problem
Possible Cause
Corrective Action
Problem
Possible Cause
Corrective Action
Rack temperature is too high
Dirty filters
Replace filters
Filter clog sensor
Call Vertiv™ Technical Support
Incorrect position of remote
temperature sensors
Verify that remote temperature sensors are correctly positioned
Inlet water temperature too high
Check cooling water temperature
Cold air short-cycling issues
Verify unit positioning/room configuration
Insufficient room cooling capacity
Reduce rack heat load or add cooling units
Water-regulating valves issue
Contact your local Vertiv™ representative
Unit safety device tripped
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
Inlet water temperature too low
Check cooling water temperature
Low room humidity
Humidifier problem
Check fault LED on humidifier PCB enclosure
Room humidity problem
Room humidity has exceeded the humidity control band. Verify set points
and confirm room is properly sealed
Unit fan fails to start
Fan is faulty
Contact your local Vertiv™ representative
Fan failure alarm
Confirm fan contractor 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
Fans will not modulate from 100%
Fan control not properly set
Contact your local Vertiv™ representative
Table 9.1 Troubleshooting
9 Maintenance
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Vertiv™ Liebert® CRV CRC30 and CRC60 Chilled Water Cooling System User Manual