Troubleshooting Guide
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Only for training and service purposes
LGE Internal Use Only
1. Wrong connection between Comp and Fan
PCB
2. Fan PCB power not supplied
3. ODU Comp/Fan PCB defect
Error No. Error Type Error Point Main Reasons
Fan controller didn't receive signal
from Comp PCB
Communication error
(Fan PCB ÷ Comp
PCB)
105*
Master
1051
Slave1
1052
Slave2
1053
Slave3
1054
n Error Diagnosis and Countermeasure Flow Chart
1. Check communication cable between Comp PCB and fan PCB
→ Reconnect or replace wire if abnormality found
Check communication cable between Comp PCB and fan PCB
→ Reconnect or replace wire if abnormality found
Yes
No
Yes
No
Is fan PCB communication
LED(yellow) blinking
normally?
Is Comp PCB
communication LED(yellow)
blinking normally?
Yes
Is fan PCB assembly normal?
Recheck power and
installation condition
No
Communication Connecter Communication LED
Comp Fan Communication
Connection
Replace inverter PCB assembly
Fan PCB assembly
Yes
No
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