Concept Of 'Classified Trouble; Troubleshooting Guide - LG AH-W096A0 Service Manual

Code
Description
No.
03 Bad communication between control panel
and indoor uni
I Error diagnosis and countermeasure flow chart
Does the error occur
again when the control
panel is replaced?
Yes
Does the error occur
again when the cable
(between control panel
and PCB) is replaced?
Yes
Replace indoor unit PCB
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.
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Cause
• Incorrect
connection
between
sensor and
PCB
• PCB fault
• Sensor fault
No
Replace the control panel
Check if the wire is
No
connected tightly and also
check wire itself
- 63 -

Troubleshooting Guide

Normal Condition
• Wire connection between control panel
and indoor unit PCB should be tight
• Output voltage of PCB should be 12Vdc
Indoor Unit
12V S GND
(RD) (YL)
Check the Voltage.
LGE Internal Use Only
(BK)
12Vdc
V