LG ARUM072BTE5 Installation Manual page 166

ERROR CODE TABLES
Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
WARNING
troubleshooting of the Multi V product.
Table 79: Error Codes, continued.
Error Code
Master outdoor unit liquid pipe temperature sensor
1 1 3 1
error.
Slave1 outdoor unit liquid pipe temperature sensor
1 1 3 2
error.
Slave2 outdoor unit liquid pipe temperature sensor
1 1 3 3
error.
Master outdoor unit subcooling inlet temperature
1 1 4 1
sensor error.
Slave1 outdoor unit subcooling inlet temperature
1 1 4 2
sensor error.
Slave2 outdoor unit subcooling inlet temperature
1 1 4 2
sensor error.
Master outdoor unit subcooling outlet temperature
1 1 5 1
sensor error.
Slave1 outdoor unit subcooling outlet temperature
1 1 5 2
sensor error.
Slave2 outdoor unit subcooling outlet temperature
1 1 5 3
sensor error.
Master outdoor unit low oil level or oil level sensor
1 1 6 1
error.
1 1 6 2 Slave1 outdoor unit oil level sensor error.
1 1 6 3 Slave2 outdoor unit oil level sensor error.
Communication error between master outdoor unit
1 4 5 1
main board and external board.
Communication error between slave1 outdoor unit
1 4 5 2
main board and external board.
1 4 5 3 Communication error between slave2 outdoor unit
main board and external board.
Master outdoor unit compressor discharge superheat
1 5 0 1
not satisfied.
Slave1 outdoor unit compressor discharge superheat
1 5 0 2
not satisfied.
Slave2 outdoor unit compressor discharge superheat
1 5 0 3
not satisfied.
1 5 1 1 Master outdoor unit operation mode conversion error.
1 5 1 2 Slave1 outdoor unit operation mode conversion error.
1 5 1 3 Slave2 outdoor unit operation mode conversion error.
For detailed information on how to troubleshoot each error, see the Multi V Service Manual on www.lghvac.com.
166
Description
Due to our policy of continuous product innovation, some specifications may change without notification.
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Details
• Check the connection on the outdoor unit PCB.
• Thermistor disconnected or shorted.
• Check the connection on the outdoor unit PCB.
• Thermistor disconnected or shorted.
• Check the connection on the outdoor unit PCB.
• Thermistor disconnected or shorted.
• Master outdoor unit may have low oil levels.
• Master outdoor unit oil level sensor disconnected or shorted.
• Slave1 outdoor unit may have low oil levels.
• Slave1 outdoor unit oil level sensor disconnected or shorted.
• Slave2 outdoor unit may have low oil levels.
• Slave2 outdoor unit oil level sensor disconnected or shorted.
Master outdoor unit main board to external board communica-
tion failure.
Slave1 outdoor unit main board to external board communica-
tion failure.
Slave2 outdoor unit main board to external board communica-
tion failure.
• Outdoor unit compressor discharge superheat not satisfied for
≥5 minutes.
• Code can only occur when the outdoor is operating in cooling
mode (all indoor units must be in cooling mode; error cannot
occur during simultaneous operation).
• After at least 10 minutes of compressor operation, the master
outdoor unit microprocessor will calculate the system's com-
pressor superheat. If at any time during compressor operation
where all indoor units in thermal on are in cooling mode and
the compressor superheat falls <3ºC for ≥5 minutes, there is
a high probability that liquid could flood back to the inlet of the
compressor scroll, resulting in compressor damage.
• If error occurs 3 times within any 1 hour period of compressor
operation, the system will shut down and remain off. A manual
restart will be necessary.
Pressure imbalance between outdoor units.