Alarm
ID
Meaning Possible Cause Handling Method
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 9.2 System alarm information (continued)
Alarm
ID
Meaning Possible Cause Handling Method
(1-4)
00
EC Fan high link current
1. EC Fan is locked.
2. EC Fan is damaged.
For cause 1, check if EC Fan is locked.
For cause 2, replace EC Fan
(1-4) 01 EC Fan drive error EC Fan is damaged. Replace EC Fan
(1-4) 02
EC Fan earth to ground
fault
EC Fan is damaged. Replace EC Fan
(1-4) 03
EC Fan electronics heat
sink thermal overload
1. EC Fan is locked.
2. EC Fan is damaged.
3. Ambient temperature is too
high
For cause 1, check if EC Fan is locked.
For cause 2, replace EC Fan
For cause 3, check ambient temperature.
(1-4)
04
EC Fan Hall failure EC Fan is damaged. Replace EC Fan
(1-4) 05 EC Fan IGBT failure EC Fan is damaged. Replace EC Fan
(1-4) 06 EC Fan line fault Power supply abnormal Check power supply
(1-4) 07 EC Fan motor locked Motor is locked Check if EC Fan is locked.
(1-4) 08
EC Fan motor thermal
overload
1. EC Fan is locked.
2. EC Fan is damaged.
3. Ambient temperature is too
high
For cause 1, check if EC Fan is locked.
For cause 2, replace EC Fan
For cause 3, check ambient temperature.
(1-4) 09 EC Fan phase failure alarm Phase failure Check power supply
Table 9.3 EC Fan alarm information
Vertiv | Liebert® MC™ Installer/User Guide | 96
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