LG ARNU Series - Page 273

Troubleshooting Guide
- 273 -
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Refer to CH33
Error No. Error Type Error Point Main Reasons
Compressor is off because of
Over-increase of constant com-
pressor discharge temperature of
Sub outdoor unit
Over-increase of constant
compressor discharge tem-
perature of Sub outdoor
100,101 (Sub1)
102,103 (Sub2)
152,153 (Sub3)
1. Loose connection of power cables
/transmission cables (Open/Short)
2. Defect of each outdoor unit PCB
3. Defect of PCB power fuse / trans-
former
Error No. Error Type Error Point Main Reasons
Transmission error of outdoor unit
each other
104: Main outdoor unit can’t receive
signal from Sub 1
111, 142, 156 : each Sub outdoor
unit can’t receive
signal from Main
outdoor unit
Transmission error of out-
door each other
104 (Main)
111 (Sub1)
142 (Sub2)
156 (Sub3)
■ Error diagnosis and countermeasure flow chart
Does transmission LED
(Red) of corresponding
Sub PCB blinks? [refer electric
component part]
Yes
No
Is PCB input power of
transformer, PCB power fuse
normal? [refer electric
component part]
Check and replace
corresponding parts/
Input power
No
Yes
Replace related SUB PCB
Is transmission cables
of outdoors connected
correctly? [refer electric
component part]
Yes
No
Re-connect transmission cables
Replace MAIN PCB