Vertiv | Liebert® DM | User Manual 105
Troubleshooting
Symptom Possible Cause User Needs to Check Particulars or Processing Method
Low pressure alarm
Refrigerant leakage
Check for leaking point and fix it immediately and then
re-charge the system with adequate amount of refrigerant.
Outdoor ambient temperature is too
low
Contact Vertiv representative for maintenance support or
engineering assistance.
Outdoor unit fan running at full
speed upon low outdoor ambient
temperature
Check if the outdoor unit cabling is correct; and check
whether the condensate pressure sensor works normally.
High temperature
alarm
High temperature setpoint is
unreasonable
Reset the setpoint.
Room load exceeding unit design
ability
Check for room sealing or make capacity expansion.
Low temperature
alarm
Low temperature setpoint is
unreasonable
Reset the setpoint.
Electrical heater operating current
is unreasonable
Check if the electrical heater operation is normal.
High humidity
alarm
High humidity setpoint is
unreasonable
Reset the setpoint.
Vapor barrier is not done in the
room
Check for the vapor barrier.
Low humidity alarm
Humidifier does not work
Check if the water supply is normal. Contact Vertiv
representative for maintenance support or engineering
assistance.
Setpoint is unreasonable Reset the setpoint.
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