LG Multi V Manual&Nbsp;

Troubleshooting Guide
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Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
System is turned off by outdoor unit Inverter
Compressor High Discharge Temperature
System is turned off by excessive increase of high
pressure of outdoor unit
System is turned off by excessive decrease of low
pressure of outdoor unit
Outdoor Unit Inverter Compressor CT Sensor open or
short
Outdoor Unit Inverter Compressor Discharge
Temperature Sensor open or short
Outdoor Unit Low Pressure Sensor open or short
Outdoor Unit High Pressure Sensor open or short
Outdoor Unit Air Temperature Sensor open or short
Outdoor Unit Heat Exchanger Temperature Sensor
open or short
Outdoor Unit Suction Temperature Sensor open or
short
Excessive connection of indoor units compared to
capacity of outdoor unit
Failing to receive inverter signal at main PCB of
Outdoor Unit
Failing to receive indoor unit signal at main PCB of out-
door Unit.
Check EEPROM checksum error when resetting power
When Heat sink temperature is above setting value
When the temperature sensor value is too high
Fan operation fail at starting or during operation
Instant Over Current(Peak) of Outdoor Unit PFC
Communication Fail Between Outdoor Unit Fan
MICOM and EEPROM or omitting EEPROM
Outdoor Unit Inverter Compressor
High Discharge Temperature
High Pressure of Outdoor Unit
Low Pressure of Outdoor Unit
Outdoor Unit Inverter Compressor
CT Sensor Fault
Outdoor Unit Inverter Compressor
Discharge Temperature Sensor Fault
Outdoor Unit Low Pressure Sensor Fault
Outdoor Unit High Pressure Sensor Fault
Outdoor Unit Air Temperature Sensor Fault
Outdoor unit Heat Exchanger
Temperature Sensor Fault
Outdoor Unit Suction Temperature
Sensor Fault
Excessive capacity of indoor units
Transmission error : inverter PCB
→ Main PCB
Transmission error : indoor unit →
main PCB of outdoor unit
Inverter PCB EEPROM error
Heat sink temperature high error
Heat sink temperature sensor error
Fan lock
Instant Over Current(Peak) of
Outdoor Unit PFC
Outdoor Unit Main PCB EEPROM
Error
Outdoor Unit Liquid pipe
Temperature Sensor Error
Outdoor Unit Subcooling Inlet
Temperature Sensor Error
Outdoor Unit Subcooling Outlet
Temperature Sensor Error
Failure of operation mode conver-
sion at Outdoor Unit
Liquid pipe temperature sensor of outdoor unit is open
or short
Outdoor Unit Subcooling Inlet Temperature Sensor
open or short
Outdoor Unit Subcooling Outlet Temperature Sensor
open or short
Pressure unbalance between outdoor units
Display Title Cause of Error
321
341
351
401
411
421
431
441
451
461
511
521
531
601
621
651
671
731
861
11 3 1
11 4 1
11 5 1
15 1 1
Outdoor unit related error

LG Multi V Specifications

General

Type	VRF (Variable Refrigerant Flow)
Compressor Type	Scroll
Refrigerant	R410A
Energy Efficiency	High
Control System	Centralized and individual control options
Indoor Units	Multiple types available (e.g., ceiling cassette, wall-mounted, ducted)