144 145
_TROUBLE SHOOTING GUIDE BOOK _
- 161 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. Wiring defect between HR unit and
upgraded 485 modem
2. Defect of the upgraded 485 PCB modem
3. Defect of the HR unit PCB
Error No. Error type Error point Main reasons
4 series upgraded 485 com-
munication error
between HR unit and HR
unit modem
Communication error
between HR unit and
the upgraded 485
modem
205C#HR
1. Defect of power cable of HR unit or com-
munication line connection
2. Error of address allocation rotary switch
setting of HR unit
3. Defect of the HR unit PCB
Error No. Error type Error point Main reasons
When the HR unit address is
set duplicated
at the 4 series upgraded 485
communication
Duplicate address error
of HR unit
206C#HR
n
Error diagnosis and countermeasure flow chart
1) Check the communication connection between HR unit and the upgraded 485 modem, and check for the red
LED on
2) Reset the outdoor unit and the power of HR unit if the red LED of the upgraded 485 modem is on
3) Replace the upgraded 485 modem if the red LED is flashing at the upgraded 485 modem
4) Replace the HR unit PCB if the red LED of the upgraded 485 modem is flashing even after replacing the
upgraded 485 modem.
n Error diagnosis and countermeasure flow chart
1) Check whether the rotary switch setting of HR unit PCB is set differently for HR units
2) Reset the outdoor unit and the power of HR unit by setting the rotary switch of HR unit PCB differently for HR
units
3) Perform the auto addressing again after performing the number 2 process
4) Replace the corresponding HR unit PCB if the same error code is occurred even after performing the number 3
process
• The above error code is only occurred at the upgraded 485 communication (9600bps communication)
• Refer to the installation manual of the outdoor unit for the address setting to HR unit rotary switch for HR units
Upgraded 485 Modem
- 161 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. Wiring defect between HR unit and
upgraded 485 modem
2. Defect of the upgraded 485 PCB modem
3. Defect of the HR unit PCB
Error No. Error type Error point Main reasons
4 series upgraded 485 com-
munication error
between HR unit and HR
unit modem
Communication error
between HR unit and
the upgraded 485
modem
205C#HR
1. Defect of power cable of HR unit or com-
munication line connection
2. Error of address allocation rotary switch
setting of HR unit
3. Defect of the HR unit PCB
Error No. Error type Error point Main reasons
When the HR unit address is
set duplicated
at the 4 series upgraded 485
communication
Duplicate address error
of HR unit
206C#HR
n Error diagnosis and countermeasure flow chart
1) Check the communication connection between HR unit and the upgraded 485 modem, and check for the red
LED on
2) Reset the outdoor unit and the power of HR unit if the red LED of the upgraded 485 modem is on
3) Replace the upgraded 485 modem if the red LED is flashing at the upgraded 485 modem
4) Replace the HR unit PCB if the red LED of the upgraded 485 modem is flashing even after replacing the
upgraded 485 modem.
n
Error diagnosis and countermeasure flow chart
1) Check whether the rotary switch setting of HR unit PCB is set differently for HR units
2) Reset the outdoor unit and the power of HR unit by setting the rotary switch of HR unit PCB differently for HR
units
3) Perform the auto addressing again after performing the number 2 process
4) Replace the corresponding HR unit PCB if the same error code is occurred even after performing the number 3
process
• The above error code is only occurred at the upgraded 485 communication (9600bps communication)
• Refer to the installation manual of the outdoor unit for the address setting to HR unit rotary switch for HR units
Upgraded 485 Modem
Error No. Error Type Error Point Main Reasons
205C#HR
Communication
error between
HR unit and the
upgraded 485
modem
4 series upgraded
485 communication
error between HR
unit and HR unit
modem
1. Wiring defect between HR unit and up
-
graded 485 modem
2. Defect of the upgraded 485 PCB modem
3. Defect of the HR unit PCB
Error No. Error Type Error Point Main Reasons
206C#HR
Duplicate address
error of HR unit
When the HR unit
address is set
duplicated at the 4
series upgraded 485
communication
1. Defect of power cable of HR unit or com
-
munication line connection
2. Error of address allocation rotary switch
setting of HR unit
3. Defect of the HR unit PCB
- 160 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. Defective connection in HR unit power
supply and communication connection
2. Wrong setting of the HR unit rotary
switch and dip switch
3. Defective HR unit PCB
Error No. Error type Error point Main reasons
Transmission error between
the HR unit and outdoor unit
Transmission error
between the HR unit
and outdoor unit
204C#HR
n Error diagnosis and countermeasure flow chart
1) Check connection between power cables and communication cables, check communication green LED blink of
HR unit PCB
2) If communication green LED blink of HR unit PCB is normal, check setting of rotary switch of HR unit and dip
switch(Refer to CH200),
Reset power of outdoor and HR unit
(If communication error of HR unit occurs, it can’t be released until reset of outdoor power)
3) If communication green LED blink of HR unit PCB is abnormal(not blinking,just on), check communication condi-
tion of total indoor units(Refer to CH05)
If communication green LED blink of HR unit PCB is abnormal(not blinking, just on) even if communication con-
dition is normal, replace HR unit PCB
[NB] If Indoor units/communication cables of HR unit and cables of power 220V has been changed each other,
communication parts and indoor will be burnt
HR Unit PCB
SW02M
(Dip switch for setup of
The function of HR unit)
SW03M
SW04M
SW01M/SW03M/SW04M
(Switch for manual valve
addressing)
SW01M
SW05M
#1 valve housing
#4 valve housing
7-SEG
Error No. Error Type Error Point Main Reasons
204C#HR
Transmission error
between the HR
unit and outdoor
unit
Transmission error
between the HR unit
and outdoor unit
1. Defective connection in HR unit power sup
-
ply and communication connection
2. Wrong setting of the HR unit rotary switch
and dip switch
3. Defective HR unit PCB
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