Vertiv™ | Liebert® SRC-G | User Manual 74
Troubleshooting
Chapter 7: Troubleshooting
Troubleshooting is to be performed by the trained and qualified service personnel. However, the checklists have
been provided just for reference purpose.
• Certain circuits carry lethal voltages. Only professional technicians are allowed to maintain the unit.
Extreme care and caution is required while troubleshooting the unit online.
• If jumpers are used for troubleshooting, remember to remove the jumpers after the troubleshooting, if not
removed the connected jumpers may bypass certain control functions and increase the risk to the unit.
Table 7-1 represents the troubleshooting of the indoor unit of Liebert® SRC-G units.
Table 7-1 Troubleshooting of the Indoor Unit
Symptom Possible Cause User Needs to Check Particulars or Processing Method
The unit does not
start
No power supply to the unit Check unit input voltage
Circuit breaker of controller voltage
is open
Locate short circuit and reset circuit breaker
Low power supply voltage Check for power supply volatge at SPD (if available)
No cooling
Compressor contactor not engaging
(not connecting) in
Check for 220 Vdc of coil. If the voltage is right, check if
the contactor is connected properly
High compressor discharge
pressure
See if there is “High pressure alarm” and follow the
maintenance descriptions
Plugged strainer
Check if strainer is clogged or damaged, if it is then clean
or replace the strainer accordingly
Low refrigerant charge
Use suction and discharge pressure gauge to check
if pressure is as per requirement. Also, see if there any
evident of bubbles exists in the sight glass
Display abnormal
Static discharge Disconnect the system power supply, and then restart
Loose connection between keypad
and control board
Check the connections are firmly fixed after powering O,
the unit and then restart the unit
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