LG ARUN Series Service Manual page 126

Troubleshooting Guide
Error No. Error Type
105*
Master Transmission error
11 ¡ 051
(Fan PCB ↔ Inverter
Slave
PCB)
12 ¡ 052
I Error Diagnosis and Countermeasure Flow Chart
Is fan PCB communication
LED(yellow) blinking
normally?
Yes
Is inverter PCB
communication LED(yellow)
blinking normally?
Yes
Is fan PCB assembly normal?
Yes
Recheck power and
installation condition
Checking 15V input
Communication connector
❈ Note : Check fan PCB assembly Error LED blinking (Check 108π¯ Error)
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Error Point
Fan controller didn't receive signal
from inverter controller
No
1. Check DC 15V power cable between Inverter PCB and fan PCB
2. Check communication cable between Inverter PCB and fan PCB
¡ Reconnect or replace wire if abnormality found
No
Check communication cable between Inverter PCB and fan PCB
¡ Reconnect or replace wire if abnormality found
No
Fan PCB assembly
Yes
Fan communication
connection
Communication LED
- 126 -
Main Reasons
1. Wrong connection between Inverter and
Fan PCB
2. Fan PCB power not supplied
3. ODU Inv/Fan PCB defect
No
Replace inverter PCB assembly
Fan Error LED
Error LED
LGE Internal Use Only