LG ARNU Series, Service Manual

Page: 133 / 226

Service Manual 133
Troubleshooting Guide
Indoor Unit outlet
pipe temp. sensor
error
Error
Code
Error Contents Meaning Main Causes
Error display
position
06
Indoor Unit sensor open
or short
Refer to CH01
All Indoor Units
are not running in
the same
mode(All units
must run either in
heating or cooling
mode )
Error
Code
Error Contents Meaning Main Causes
Error display
position
07
The Indoor Unit later start-
ed is in different mode
than the unit started at
first .
Concerned
Remote controller
Panel Display
1. The Indoor Units are in a different
operation mode.
2. The error display will be in the
Wired Remote Controller of the
unit stared later.
Indoor Unit EEP-
ROM error
Error
Code
Error Contents Meaning Main Causes
Error display
position
09
Problem developed in the
EEPROM inside the PCB
of the Indoor Unit
Concerned
Remote controller
Panel Display
1. Error developed in communication
between the Microprocessor and
the EEPROM on the surface of the
PCB.
2. ERROR due to the EEPROM
damage
■
Defect inspection method :
1) Error removal method : Press the On/Off button on the Wired Remote controller. The error code will be removed
automatically after a few seconds.
2) Immediately change the operation mode after the pressing the On/Off button. (The same operation mode as in
the original Indoor Unit started at first (other than the defective unit mode) (heating /cooling )
■
Defect inspection method :
1) Check whether there is some stains at the EEPROM PIN (Lead remnants) .
Remove this unwanted material and re-operate the "Auto-Addressing".
2) Replace the Indoor Unit PCB.