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Chapter 8: Troubleshooting
This chapter introduces the failure diagnosis and troubleshooting, and can be used together with the alarm
section.
• Prior to operation and maintenance, the lethal voltage may be present in the unit 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.
• If jumpers are used for troubleshooting, ensure to remove the jumpers after the troubleshooting is done. If
the connected jumpers are not removed, they may bypass certain control function causing damage to the
unit.
8.1.Fan Troubleshooting
The fan troubleshooting is listed in
Symptom
The MCB is open
Fan power module
failure
EC fan cannot
be started
The cable is faulty
8.2.Fault Diagnosis and Handling of Electronic Expansion Valve (EEV)
As a key component for refrigerant system and cooling capacity adjustment, the working of the EEV is
important.
Table 8-2
describes the fault diagnosis and handling methods.
Vertiv | Liebert XDH | User Manual
Table
8-1.
Table 8-1 Fan Fault Diagnosis and Handling
Potential Causes
Check if the fan MCB is closed.
Check the alarm indicator of the fan power module to check if the
control board fails.
Check whether the cable from the main control board, fan fault
detection board, or power module to the control terminal bar are
firmly connected.
Check whether the cable from the control terminal bar to the plug
wire terminal of the fan is firmly connected.
Check Items and Handling Methods
Troubleshooting
67
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