Liebert CRAC Fault Codes & Troubleshooting | Vertiv Cooling Alarms Australia
Troubleshooting Liebert, Emerson Network Power and Vertiv CRAC fault codes for precision cooling systems used in data centres, telecommunications infrastructure and critical facilities across Australia
Liebert CRAC Fault Codes & Troubleshooting Guide
Vertiv, Emerson Network Power & Liebert Precision Cooling Alarm Reference
Liebert CRAC units are widely used in data centres, telecommunications facilities and mission-critical infrastructure where stable environmental control is essential.
Over time, operators may encounter alarm codes or system faults displayed on the CRAC controller.
This guide explains common Liebert CRAC alarms, their causes and recommended troubleshooting steps.
Understanding Liebert CRAC Alarm Systems
Modern Vertiv precision cooling systems use advanced monitoring platforms to detect faults before cooling performance is affected.
Typical alarm triggers include:
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High return air temperature
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Low airflow
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Fan motor failure
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Refrigerant pressure faults
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Sensor errors
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Controller communication faults
Many modern units use Vertiv iCOM controllers, while older systems may operate under Emerson or Liebert control platforms.
Common Liebert CRAC Fault Codes
| Alarm | Description | Possible Cause | Recommended Action |
|---|---|---|---|
| High Return Air Temp | Air temperature above setpoint | Cooling failure | Inspect airflow |
| Low Airflow Alarm | Insufficient airflow detected | Fan motor issue | Check fans |
| High Head Pressure | Refrigerant pressure too high | Condenser issue | Inspect condenser |
| Low Suction Pressure | Refrigerant pressure low | Refrigerant leak | Check cooling circuit |
| Humidity Sensor Fault | Invalid humidity reading | Sensor failure | Replace sensor |
| Temperature Sensor Fault | Sensor reading error | Faulty sensor | Replace sensor |
| Condensate High Level | Water detected in tray | Blocked drain | Clear drain |
| Fan Failure Alarm | Fan not operating | Motor or controller failure | Replace motor |
Vertiv iCOM Controller Alarms
Modern Liebert systems use iCOM control platforms which provide more detailed diagnostics.
Common iCOM alerts include:
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Fan speed alarms
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Sensor calibration faults
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Compressor protection alarms
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Communication failures
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Remote shutdown signals
These alerts help technicians identify system faults quickly.
Troubleshooting CRAC System Alarms
When an alarm occurs, technicians should follow these steps.
Step 1 – Identify Alarm Code
Check the CRAC controller display or BMS interface.
Step 2 – Inspect Airflow
Common airflow issues include:
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Blocked filters
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Fan motor failure
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Fan controller faults
Step 3 – Inspect Cooling Circuit
Check for:
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Refrigerant pressure faults
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Expansion valve issues
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Condenser fan problems
Step 4 – Verify Sensors
Inspect:
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Temperature sensors
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Humidity sensors
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Pressure transducers
Replacement Parts for CRAC Fault Repairs
Many CRAC alarms require replacement components.
Common spare parts include:
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Fan motors
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EC fan assemblies
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Control boards
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Sensors
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Pressure switches
View our Liebert CRAC Spare Parts Page
CRAC Systems We Support
Indigi Power & Cooling supports precision cooling systems including:
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Liebert DS
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Liebert DSE
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Liebert PEX
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Liebert PCW
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Liebert CRV
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Liebert Deluxe System
Precision Cooling Support Across Australia & PNG
Our team supports Liebert CRAC systems across:
Brisbane
Sydney
Melbourne
Regional Australia
Papua New Guinea
We assist data centres, telecom providers, mining operations and critical infrastructure operators.
Need Help Diagnosing a CRAC Fault?
If your system has triggered an alarm, provide:
• CRAC model
• Serial number
• Alarm code
• Site location
Our team can assist with diagnosis and spare parts supply.
Partner with Us
Reliable Power & Cooling Solutions from Indigi Power & Cooling Expert supply, installation, and contracting services for critical infrastructure across Australia.