080 081
_TROUBLE SHOOTING GUIDE BOOK _
2. Error Code Check
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Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
01
02
06
08
16
17
18
Air temperature sensor error
Gas side temperature sensor error
Liquid side temperature sensor error
Water tank temperature sensor error
Water inlet & outlet temperature sensor error
Water inlet temperature sensor error
Water outlet temperature sensor error
Sensor is
open/short
1. Indoor unit PCB wrong connection!
2. Indoor unit PCB failure!
3. Sensor problem (main reason)
Error
No.
Error Type Error Point Main Reasons
n Error diagnosis and countermeasure flow chart
Is sensor properly
connected to PCB?
Is the resistance value
of sensor normal?*
Connect properly to PCB
Change the sensor
Change the PCB
Yes
Yes
No
No
* If the resistance value of the temperature sensor changes according to temperature, and the following resistance
values are displayed based on the current temperature, it is normal. (±5% error)
Air temperature sensor : 10℃(50℉)=20.7kΩ : 25℃(77℉)=10kΩ : 50℃(122℉)=3.4kΩ
Gas/Liquid side temperature sensor : 10℃(50℉)=10kΩ : 25℃(77℉)=5kΩ : 50℃(122℉)=1.8kΩ
Water inlet/outlet temperature sensor : 10℃(50℉)=10kΩ : 25℃(77℉)=5kΩ : 50℃(122℉)=1.8kΩ
Water tank temperature sensor : 10℃(50℉)=10kΩ : 25℃(77℉)=5kΩ : 50℃(122℉)=1.8kΩ
Major error Diagnosis Method
- 101 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
CN-REMO : Remote controller connection
❇ The PCB can differ from model to model.
Check from the right source.
Checking communication cable connection status
Does the error happens
again if the remote
controller is replaced?*
Does the error occurred
when the cable of remote
controller is replaced?
Replace cabled remote
controller
Check connection &
communication cable **
Replace indoor unit PCB ***
Yes
Yes
No
No
03 No communication between cabled
remote controller & indoor unit
Error
No.
Error Type Error Point Main Reasons
The remote controller
did not receive the sig-
nal from indoor unit
during specific time
1. Remote controller fault
2. Indoor unit PCB fault
3. Connector fault, Wrong connection
4. Communication cable problem
n
Error diagnosis and countermeasure flow chart
* If there is no remote controller to replace : Use another unit’s remote controller doing well
** Check cable : Contact failure of connected portion or extension of cable are main cause
Check any surrounded noise ( check the distance with main power cable)
‘ make safe distance from the devices generate electromagnetic wave
*** After replacing indoor unit PCB, do Auto Addressing & input unit’s address if connected to central controller.
(All the indoor units connected should be turned on before Auto Addressing
Error No. Error Type Error Point Main Reasons
01 Air temperature sensor error
Sensor is
open/short
1. Indoor unit PCB wrong connection!
2. Indoor unit PCB failure!
3. Sensor problem (main reason)
02 Gas side temperature sensor error
06 Liquid side temperature sensor error
08 Water tank temperature sensor error
16
Water inlet & outlet temperature sensor error
17 Water inlet temperature sensor error
18 Water outlet temperature sensor error
Error No. Error Type Error Point Main Reasons
03
No communication between
cabled remote controller &
indoor unit
The remote control
-
ler did not receive the
signal from indoor unit
during specific time
1. Remote controller fault
2. Indoor unit PCB fault
3. Connector fault, Wrong connection
4. Communication cable problem
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