Vertiv Liebert DM Series User Manual

Vertiv | Liebert® DM | User Manual 108
Troubleshooting
The outdoor unit fault diagnosis and treatment measures are shown in Table 8-2.
Table 8-2 Outdoor Unit Fault Diagnosis and Treatment
Alarm ID Alarm Name Possible Cause
User Needs to Check Particulars or
Processing Method
A00
Phase loss
alarm
One-phase or two-phase loss of three-
phase voltage
Measuring whether the three-phase live line
voltage is correct.
Input reverse connection Check input line sequence.
Fan speed controller board hardware
failure
Compare after replacing the fan speed
controller board.
A01
SCR over
temperature
Fan stalling and other faults Check if the fan is functioning properly.
Fan speed controller board hardware
failure
Compare after replacing the fan speed
controller board.
A02
A03
Fan 1 is over
temperature,
Fan 2 is over
temperature
Fan stalling and other faults Check if the fan is functioning properly.
Fan speed controller board hardware
failure (detect circuit failure or SCR
power supply circuit failure)
Compare after replacing the fan speed
controller board.
A04
Pressure
sensor failure
The pressure sensor is not installed or
the terminal is not connected properly
Check the pressure sensor cabling.
Current type pressure sensor short-
circuit terminals J17 and J18 are not
mounted with short-circuited jumper
caps
Mount short-circuited jumper caps when
configuring the current type pressure sensor.
Pressure sensor failure Compare after replacing the pressure sensor.
Fan speed controller board hardware
failure
Compare after replacing the fan speed
controller board.

Vertiv Liebert DM Series Specifications

General

Brand	Vertiv
Model	Liebert DM Series
Category	Air Conditioner
Language	English