LG ARUN50GS2A Quick Manual page 29

Self-Diagnosis Function (U3 Chassis, 2 Fan Model)
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 outdoor unit 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 LED of 7-segment indicates error number, 3rd LED indicates unit number.
Display
Air temperature sensor of indoor unit
0 1 -
Inlet pipe temperature sensor of indoor unit
0 2 -
Communication error : wired remote controller ÷ in-
0 3 -
door unit
Drain pump
0 4 -
Communication error : outdoor unit ÷ indoor unit
0 5 -
Outlet pipe temperature sensor of indoor unit
0 6 -
Indoor EEPROM Error
0 9 -
Poor fan motor operation
1 0 -
Outdoor Unit Inverter Compressor IPM Fault
2 1 1
Inverter Board Input Over Current(RMS) of Outdoor
2 2 1
Unit
Outdoor Unit Inverter Compressor DC link Low Volt-
2 3 1
age
Outdoor Unit High Pressure Switch
2 4 1
Outdoor Unit Input Voltage High/ Low Voltage
2 5 1
Outdoor Unit Inverter Compressor Start Failure
2 6 1
PSC/PFC Fault error
2 7 1
Outdoor Unit Inverter DC link High Voltage
2 8 1
Outdoor Unit Inverter Compressor Over Current
2 9 1
Outdoor Unit Inverter Compressor High Discharge
3 2 1
Temperature
High Pressure of Outdoor Unit
3 4 1
Low Pressure of Outdoor Unit
3 5 1
Low pressure ratio
3 6 1
Title 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 outdoor unit 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
Outdoor Unit Inverter Compressor Drive IPM Fault
Outdoor Unit Inverter Board Input Current excess (RMS)
DC charging is not performed at outdoor unit after starting relay
turn on.
System is turned off by outdoor unit high pressure switch.
Outdoor Unit input voltage is out of range.
The First Start Failure by Outdoor Unit Inverter Compressor Abnor-
mality
When over current flows instantly at PSC/PFC
System is turned off by outdoor unit DC Voltage Over Charging
Outdoor Unit Inverter Compressor Fault OR Drive Fault
System is turned off by outdoor unit Inverter Compressor High Dis-
charge Temperature
System is turned off by excessive increase of high pressure of out-
door unit
System is turned off by excessive decrease of low pressure of out-
door unit
Pressure ratio is under limit
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