Vertiv | Liebert PEX+ Chilled Water | User Manual 95
Diagnosis and Troubleshooting
Chapter 8: Diagnosis and Troubleshooting
This chapter introduces the troubleshooting of Liebert® PEX+Chilled Water AC, including the troubleshooting
and fault handling of fan, infrared humidifier and cooling system, and heating system.
For the diagnosis and treatment of complex fault please contact Vertiv local representative.
Prior to operation and maintenance, the lethal voltage may be present in the equipment which can be fatal. All
notes, warnings, and cautions marked on the equipment as well as the ones mentioned in the manual must be
considered, otherwise, it may lead to injury and fatality.
Qualified and professional maintenance personnel are the one supposed to operate and handle the
equipment.
8.1. Fault Diagnosis and Treatment of Fans
Refer Table 8-1 for fan fault diagnosis and treatment.
Table 8-1 Fault Diagnosis and Treatment of Fans
Symptom Potential Causes Items to be Examined or Handled
EC fan cannot
be started
Power Supply
Disconnected
Check the MCB of main fan, check if the fans L1, L2 and L3 are power-o, or
have phase failure or under voltage
Control panel failure
Check whether there is 24 Vac voltage between P36-3 and E1. if no, check
the control panel. Check whether the green LED beside silicon control Q5
on the control panel is on or not
Check whether there is less than 10 Vdc voltage between P53-2 and P53-3.
if no, check the control panel
Air loss alarm
is displayed
Air filter is clogged Check if the filter is clogged that causes low airflow, if so, replace the filter
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