Fan Troubleshooting; Fault Diagnosis And Handling Of Electronic Expansion Valve - Vertiv VRC2 Series User Manual

Fault Occurrence Possible Cause
Compressor runs at high speed
The drainage pan or pipe is loose
or blocked
The mounting position is not even
Compressor
vibration or The fixing parts are loose
abnormal noise
Compressor is faulty

8.2 Fan Troubleshooting

The fan troubleshooting is listed in Table 8-2
Symptom Probable Causes
The circuit breaker is
open
Fan power module
failure
EC fan can't be
started
The cable is faulty

8.3 Fault Diagnosis and Handling of Electronic Expansion Valve

As a key component for refrigerant system and cooling capacity adjustment, the working of the
electronic expansion valve is important. Table 8-3 describes the fault diagnosis and handling
methods.
Symptom Probable Causes
The temperature
sensor or pressure
sensor is faulty.
The
The control board is
adjustment of
powered off.
the electronic
expansion
valve is faulty.
The cable connection
of the control board
is faulty.
Vertiv I VRC Split System I User Manual
Table 8-2 Fan fault diagnosis and handling
Check Items and Handling Methods
Check if the circuit breaker is closed.
Check the alarm indicator of the fan power module to 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 is
firmly fixed.
Check whether the cable from the control terminal bar to the plug
wire terminal of the fan is firmly fixed.
Table 8-3 Fault diagnosis and handling methods
Check Items and Handling Methods
Check whether the sensor cable is firmly fixed.
Check whether the sensor cable position on the control board is
correct.
Check whether the output fuse of the transformer has
tripped/broken.
Check whether the input power of the control board of the
electronic expansion valve is of 24 V power supply.
Check whether the valve cable connection on the control board of
the electronic expansion valve is faulty.
Check whether the communication cable between the electronic
expansion valve control board and the main control board is
properly connected.
Check or Remedy
Check if the compressor is out of control
Check if drainage pipe is loose or clean the
debris in the drainage pan or pipe
Check mounting position state
Check the fixing nuts of compressor and fasten
again
Call the customer service hotline of Vertiv
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