LG ARTCOOL Series Service Manual page 43

Part 4 Trouble Shooting Guide
7.3.4 Error code 05
Discription
• Wrong wiring or missing wire between indoor and outdoor unit cable
• Defect of communication components in indoor unit PCB assembly
Supposed
• Defect of communication components in outdoor unit PCB assembly
Causes
• Defect of power supply components in outdoor unit PCB assembly
• No ground connection in air conditioner unit. (affected by noise in power source)
Wiring connection between
Indoor unit and out door unit
Is right ?
Yes
Is the voltage of T/Block
1 2 , in outdoor unit about
AC 220/240V ?
Yes
Is the voltage of GND & DC5V in
outdoor unit PCB about DC 5V ?
Yes
Ground connection is installed ?
(power outlet or outdoor chassis)
Yes
Communication circuit of indoor
& outdoor PCB Is operating
properly?
Yes
Check the noise from another
machine on communication line.
Be sure to disconnect the power cable plug from the plug socket before disassembling the
equipment for a repair. Internal components and circuit boards are at main potential when the
equipment is connected to the power cables. This voltage is extremely dangerous and may
cause death or severe injury if come in contact with it.
Be sure to turn off power switch before connect or disconnect connector, or parts damage may
be occurred.
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Communication Error
Indoor - Outdoor
No
1(BR) - 1(BR)
2(BL) - 2(BL)
3(GN/YL) - 3(GN/YL)
4(RD) - 4(RD)
No
* Check power connector
- Is not connected to the T/Block in
indoor unit.
No Check FUSE, NF01/02J, PTC,
Power Module, BD-01S in
outdoor unit PCB assembly
No Install ground connection from
outdoor unit. (In case power outlet
has no earth port)
No Check IC01K, IC02K,D01K~D03K,
ZD01K~ZD03K, R01K~R10K,
C01K~C04K
- 42 -
Earth port
LGE Internal Use Only