LG ARNU Series, Service Manual

Page: 127 / 226

Service Manual 127
Troubleshooting Guide
Indoor Unit room temp.sensor error
Unit inlet pipe temp.sensor error
(Indoor Unit)
Outlet pipe temp. sensor error
(Indoor Unit)
Error
Code
Error Contents Meaning Main Causes
Error display
position
01
02
06
Indoor Unit
sensor open
or short
Concerned
Remote con-
troller
Panel Display
1. Sensor wrong connection
2. Sensor open/Short
3. Defective Indoor Unit PCB
4. Defective Sensor
■
Defect inspection method :
1) Check the connecting point of the sensor with the PCB (Sensor's Connector).
Is the sensor connecting condition correct ? Otherwise, reconnect the sensor at the correct position.
2) Remove the sensor and measure its resistance with a tester.
Room temp sensor : 10°C = 20.7k
Ω
: 25°C = 10k
Ω
: 50°C = 3.4k
Ω
Pipe temp sensor : 10°C = 10k
Ω
: 25°C= 5k
Ω
: 50°C = 1.8k
Ω
3) Replace the sensor if it is not having a correct resistance value.
4) If there is no problem with the sensor and the sensor connection then replace the Indoor Unit PCB.
• Panel Display indication method : Error code and the LED blinking counts are indication.
Communication error
between Indoor Unit and
the Wired Remote
Controller
Error
Code
Error Contents Meaning Main Causes
Error display
position
03
In case the wired
Remote Controller
cant receive the
the signal from the
Indoor Unit
Concerned
Remote
Controller
Panel Display
1. Defective wired Remote controller.
2. Defective Indoor Unit PCB .
3. Defective Connector connection
4. Defective wire of the Wired Remote
Controller
■
Defect inspection method :
1) Check the connection point of the Wired Remote Controller (Connecting Connector).
2) In case the Wired Remote Controller's cable is installed near the AC power line, then they must be separated by
distance of at least 30cm.
3) In case the replaced Remote Controller has no defect, then the originally installed Remote Controller is defec-
tive.
4) In case the error code exists even after the replacement of the Remote Controller, then the Remote Controller is
not defective and hence only Indoor Unit PCB should be replaced.
5) In case error code exists even after the replacement of the Wired Remote Controller and the Indoor Unit PCB,
then replace the cable connecting the Wired Remote Controller and Indoor Unit.