LG ACHH Series Manual page 90

Error code check
Error number Errors
Communication
105
error (Fan PCB ÷
(11 → 051)
Inverter PCB)
n Failure diagnosis method
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
Comp Fan Communication
Connection
Communication Connector
Meaning
Fan controller didn't
receive signal from invert-
er 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
Main cause of occurrence
1. Wrong connection between Inverter and Fan PCB
2. Fan PCB power not supplied
3. Inv/Fan PCB defect
No
Replace inverter PCB assembly
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