Troubleshooting Guide
- 63 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
03
Bad communication between control panel
and indoor uni
• Incorrect
connection
between
sensor and
PCB
• PCB fault
• Sensor fault
• Wire connection between control panel
and indoor unit PCB should be tight
• Output voltage of PCB should be 12Vdc
Code
No.
Description
Cause
Normal Condition
■
Error diagnosis and countermeasure flow chart
Replace the control panel
Replace indoor unit PCB
Yes
Yes
No
No
Does the error occur
again when the control
panel is replaced?
Does the error occur
again when the cable
(between control panel
and PCB) is replaced?
Check if the wire is
connected tightly and also
check wire itself
After replacing the control panel or indoor unit PCB, it is very important to perform parameter setting by
‘entering Installer Setting Mode’ at the control panel.
If not, system will NOT be operated correctly. It is STRONGLY recommended to keep above instruction.
Check the Voltage.
Indoor Unit
V
12Vdc
12V
(RD)
S
(YL)
GND
(BK)
