LG ARUV Series Service Manual page 242

Self-diagnosis function
Display
Discharge temperature of constant
1 0 0
speed compressor 1 of sub1 outdoor
unit
Discharge temperature of constant
1 0 1 speed compressor 2 of sub1 outdoor
unit
Discharge temperature of constant
1 0 2 speed compressor 1 of sub2 outdoor
unit
Discharge temperature of constant
1 0 3 speed compressor 2 of sub2 outdoor
unit
Transmission error : sub1 outdoor unit
1 0 4
main outdoor unit
Transmission error : fan PCB
1 0 5
PCB
1 0 6
Over-current of fan motor (IPM fault)
1 0 7
Low voltage of fan motor driver
Transmission error : main PCB
1 0 8
PCB
High pressure switch of sub1 outdoor
1 0 9
unit
Reverse connection of R, S, T power
1 1 0
of sub1 outdoor unit
Transmission error : main outdoor unit
1 1 1
sub1 outdoor unit
Liquid pipe temperature sensor of
1 1 3
main outdoor unit
Subcooling inlet temperature sensor of
1 1 4
main outdoor unit
Subcooling outlet temperature sensor
1 1 5
of main outdoor unit
High pressure sensor of sub1 outdoor
1 1 6
unit
Low pressure sensor of sub1 outdoor
1 1 7
unit
Air temperature sensor of sub1 out-
1 1 8
door unit
Suction temperature sensor of sub1
1 2 0
outdoor unit
Discharge temperature sensor of the
1 2 1 constant speed compressor 1 of sub1
outdoor unit
Discharge temperature sensor of the
1 2 2 constant speed compressor 2 of sub1
outdoor unit
Temperature sensor of front-side heat
1 2 3
exchanger of sub1 outdoor unit
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Only for training and service purposes
Title
System is off by excessive increase of discharge tempera-
ture of constant speed compressor 1 of sub1 outdoor unit
System is off by excessive increase of discharge tempera-
ture of constant speed compressor 2 of sub1 outdoor unit
System is off by excessive increase of discharge tempera-
ture of constant speed compressor 1 of sub2 outdoor unit
System is off by excessive increase of discharge tempera-
ture of constant speed compressor 2 of sub2 outdoor unit
Failing to receive sub1 signal at main PCB of main outdoor
unit
main Failing to receive fan signal at main PCB
Over-current of fan motor (IPM fault)
Low voltage of fan motor driver
Failing to receive main signal at fan PCB
fan
High pressure switch of sub1 outdoor unit is operated by high
pressure rising
Reverse connection or omitting connection of R, S, T power
of sub1 outdoor unit
Failing to receive main signal at main PCB of sub1 outdoor
unit
Liquid pipe temperature sensor of main outdoor unit is open
or short
Subcooling inlet temperature sensor of main outdoor unit is
open or short
Subcooling outlet temperature sensor of main outdoor unit is
open or short
High pressure sensor of sub1 outdoor unit is open or short
Low pressure sensor of sub1 outdoor unit is open or short
Air temperature sensor of sub1 outdoor unit is open or short
Suction temperature sensor of sub1 outdoor unit is open or
short
Discharge temperature sensor of the constant speed com-
pressor 1 of sub1 outdoor unit is open or short
Discharge temperature sensor of the constant speed com-
pressor 2 of sub1 outdoor unit is open or short
Temperature sensor of front-side heat exchanger of sub1
unit is open or short
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Cause of Error
LGE Internal Use Only