Vertiv Liebert MCV440 - Page 51

Alarm ID Meaning Possible Cause Handling Method
005 Remote shutdown
1. Remote shutdown
signal is available.
2. TB38 is not
connected.
For Cause 1, check the remote shutdown signal.
For Cause 2, connect TB38.
006 Shutdown due to EC Fan alarm All fans have failed. Consult factory.
007 SPD alarm SPD damaged Replace SPD.
008 Condenser pressure Sensor 2 failure
Condenser pressure
Sensor 1 damaged.
Replace condenser pressure Sensor 1.
009 Condenser pressure Sensor 2 failure
Condenser pressure
Sensor 2 damaged.
Replace condenser pressure Sensor 2.
010 Condenser pressure 1 high alarm
High pressure: Fan failure,
clogged coils.
Low pressure: Loss of
charge
High pressure alarms: Fix fan and clean coil.
Low pressure alarms: Check for refrigerant leak.
011 Condenser pressure 2 high alarm
012 Condenser pressure 1 low alarm
013 Condenser pressure 2 low alarm
014
EC Fan speed mode maximum must be overridden
due to condenser pressure 1 high.
Condenser pressure 1 high No action is needed.
015
EC Fan speed mode maximum must be overridden
due to condenser pressure 2 high.
Condenser pressure 2
high
No action is needed.
016 Ambient temperature sensor failure
Ambient temperature
sensor damaged.
Replace ambient temperature sensor.
017 Ambient temperature high alarm Ambient temperature high No action is needed.
018 Ambient temperature low alarm Ambient temperature low No action is needed.
019 Condenser temperature Sensor 2 failure
Condenser temperature
Sensor 2 damaged.
Replace condenser temperature Sensor 1.
020 Condenser temperature Sensor 2 failure
Condenser temperature
Sensor 2 damaged.
Replace condenser temperature Sensor 2.
021 Condenser temperature 1 high alarm
High temperature: Fan
failure, clogged coils.
Low temperature: Consult
factory
High temperature alarms: Fix fan and clean coils.
Low temperature alarms: consult factory.
022 Condenser temperature 2 high alarm
023 Condenser temperature 1 low alarm
024 Condenser temperature 2 low alarm
025
EC Fan speed mode maximum must be overridden
due to refrigerant temperature 1 high.
Refrigerant temperature 1
high
No action is needed.
026
EC Fan speed mode maximum must be overridden
due to refrigerant temperature 2 high.
Refrigerant temperature 2
high
No action is needed.
Table 10.3 System Alarm Information (continued)
NOTE: In Table 10.4 on page49, (1-4) indicates the EC-fan addresses. For example, (1-4) 00 means 100 for EC Fan1,
and means 200 for EC Fan2, and means 300 for EC Fan3, and means 400 for EC Fan4.
10 Control Operation Proprietary and Confidential ©2024 Vertiv Group Corp. 47
Vertiv™ Liebert® MCV Installer/User Guide