LG AS-W0964DH0 Service Manual page 60

Troubleshooting Guide
Error code Description
5
Communication Error
Check flow
Wiring connection
Is right ?
No
Indoor Outdoor
1(BR) 1(BR)
2(BL) 2(BL)
3(GN/YL) 3(GN/YL)
4(RD) 4(RD)
YES
Communication circuit of indoor
& outdoor pcb Is right ?
No
Check IC01K, IC02K,D01K~D03K,
ZD01K~ZD03K, R01K~R10K,
C01K~C04K
60 Room Air Conditioner
• Wrong or missing wiring between indoor and outdoor unit cable
• Defect of communication components in indoor pcb assembly
• Defect of communication components in outdoor pcb assembly
• Defect of power supply components in outdoor pcb assembly
• No ground connection in air conditioner unit
(affected by noise in power source)
YES
Is the voltage of T/Block
, in outdoor about
AC 220/240V ?
No
Check power connector
Is not connected to the
T/Block in indoor unit.
YES
Cause of error
YES
Is the voltage of GND & DC5V in
Outdoor pcb about DC 5V ?
No
Check FUSE, NF01/02J, PTC,
Power Module, BD-01S in
Outdoor pcb assembly
Ground connection is installed ?
(power outlet or outdoor chassis)
No
Install ground connection from outdoor
unit. (In case power outlet has no earth
port)
Earth port