LG MULTI V M ARNU07GTU 4 Series Svc Manual page 49

3. Self-diagnosis function
Error Indicator
- This function indicates types of failure in self-diagnosis and occurrence of failure for air condition.
- Error mark is displayed on display window of indoor units and wired remote controller, and 7-segment LED of
Compressor Module control board as shown in the table.
- If more than two troubles occur simultaneously, lower number of error code is first displayed.
- After error occurrence, if error is released, error LED is also released simultaneously.
Error Display
1st,2nd,3rd LED of 7-segment indicates error number, 4th LED indicates unit number.
Ex)
＊Only applies to Module tpye VRF.
Display
0 1 Air temperature sensor of indoor unit
0 2 Inlet pipe temperature sensor of indoor unit
Communication error : wired remote
0 3
controller ↔ indoor unit
0 4 Drain pump
Communication error : Compressor
0 5
Module ↔ indoor unit
Outlet pipe temperature sensor of indoor
0 6
unit
0 9 Indoor EEPROM Error
1 0 Poor fan motor operation
Compressor Module Inverter Compressor IPM
2 1
Fault
Inverter Board Input Over Current(RMS) of
2 2
Compressor Module
Compressor Module Inverter Compressor
2 3
DC link Low Voltage
2 4 Compressor Module High Pressure Switch
Compressor Module Input Voltage High/
2 5
Low Voltage
Compressor Module Inverter Compressor
2 6
Start Failure
Compressor Module Inverter Compressor
2 9
Over Current
※ Refer to the Indoor manual for some Indoor Error code.
Title
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Cause of Error
Air temperature sensor of indoor unit is open or short
Inlet pipe temperature sensor of indoor unit is open or short
Failing to receive wired remote controller signal in indoor unit
PCB
Malfunction of drain pump
Failing to receive Compressor Module signal in indoor unit
PCB
Outlet pipe temperature sensor of indoor unit is open or
short
In case when the serial number marked on EEPROM of
Indoor unit is 0 or FFFFFF
Disconnecting the fan motor connector/Failure of indoor fan
motor lock
Compressor Module Inverter Compressor Drive IPM Fault
Compressor Module Inverter Board Input Current excess
(RMS)
DC charging is not performed at Compressor Module after
starting relay turn on.
System is turned off by Compressor Module high pressure
switch.
Compressor Module input voltage is over 487V or below
270V
The First Start Failure by Compressor Module Inverter
Compressor Abnormality
Compressor Module Inverter Compressor Fault OR Drive
Fault
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Only training and service purposes.
Self-diagnosis function