Vertiv | Liebert® DM | User Manual 106
Troubleshooting
Symptom Possible Cause User Needs to Check Particulars or Processing Method
Air exhaust
temperature alarm
Simultaneously with high voltage
alarms
Refer and follow the inspection and repair procedure for
the high pressure alarm.
Other failure
Contact Vertiv representative for maintenance support or
engineering assistance.
Floor overflow
warning
The humidifier water injection
solenoid valve is faulty and cannot
be closed. The water level is too
high and there is water overflowing
Replace the humidifier water injection solenoid valve.
Condensate water pipe is not
properly draining
Check the opening of the condensate drain for blockages,
if identified then clear it immediately and improve drainage
facility.
SPD alarm SPD failure Replace the SPD switch.
Remote shutdown Remote control shutdown Adjust remote control parameters.
Infrared humidifier
high water level
alarm
Condensate water pipe is not
draining properly
Check the opening of the condensate drain for blockages,
if identified then clear it immediately and improve drainage
facility.
Water injection solenoid valve failure
See if there is a floor overflow alarm, if identified follow the
procedure to clear the alarm.
Airflow loss alarm Return air volume is small
Remove the obstruction at the return air outlet of the unit,
clean the return air filter or contact Vertiv representative
for maintenance support or engineering assistance.
Return air
temperature sensor
fault alarm
Return air temperature and humidity
sensor failure
Replace the return air temperature and humidity sensor.
Return air humidity
sensor fault alarm
Airflow loss sensor
failure alarm
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