LG MULTI V 5 Manual Book page 73

Error No. Error type Error point
Error No. Error Type Error Point
Transmission error
Transmission error
between the HR
Transmission error
204C#HR
204C#HR between the HR unit
Transmission error between
between the HR unit
unit and outdoor
the HR unit and outdoor unit
and outdoor unit
and outdoor unit
unit
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
#1 valve housing
SW02M
(Dip switch for setup of
The function of HR unit)
SW03M
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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_TROUBLE SHOOTING GUIDE BOOK
Main reasons
Main Reasons
1. Defective connection in HR unit power sup-
1. Defective connection in HR unit power
ply and communication connection
supply and communication connection
2. Wrong setting of the HR unit rotary switch
2. Wrong setting of the HR unit rotary
and dip switch
switch and dip switch
3. Defective HR unit PCB
3. Defective HR unit PCB
#4 valve housing
7-SEG
SW05M
SW01M
SW01M/SW03M/SW04M
(Switch for manual valve
addressing)
SW04M
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LGE Internal Use Only
Error No. Error Type Error Point
Error No. Error type Error point
Error No. Communication Error type 4 series upgraded Error point
error between 485 communication
205C#HR HR unit and the Communication error error between HR 4 series upgraded 485 com-
Communication error 4 series upgraded 485 com-
between HR unit and munication error
upgraded 485 unit and HR unit
205C#HR
between HR unit and munication error
the upgraded 485
between HR unit and HR
modem modem
205C#HR
the upgraded 485
modem between HR unit and HR
unit modem
modem
unit modem
n Error diagnosis and countermeasure flow chart
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
1) Check the communication connection between HR unit and the upgraded 485 modem, and check for the red
LED on
LED on
2) Reset the outdoor unit and the power of HR unit if the red LED of the upgraded 485 modem is 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
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
4) Replace the HR unit PCB if the red LED of the upgraded 485 modem is flashing even after replacing the
upgraded 485 modem.
upgraded 485 modem.
Error No. Error Type Error Point
Error No. Error type Error point
Error No. Error type Error point
When the HR unit
address is set
Duplicate address When the HR unit address is
206C#HR duplicated at the 4
When the HR unit address is
Duplicate address error set duplicated
error of HR unit
206C#HR
series upgraded 485
Duplicate address error set duplicated
of HR unit
at the 4 series upgraded 485
206C#HR
of HR unit
communication at the 4 series upgraded 485
communication
communication
n Error diagnosis and countermeasure flow chart
n Error diagnosis and countermeasure flow chart
1) Check whether the rotary switch setting of HR unit PCB is set differently for HR units
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
2) Reset the outdoor unit and the power of HR unit by setting the rotary switch of HR unit PCB differently for HR
units
units
3) Perform the auto addressing again after performing the number 2 process
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
4) Replace the corresponding HR unit PCB if the same error code is occurred even after performing the number 3
process
process
• The above error code is only occurred at the upgraded 485 communication (9600bps communication)
• 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
• Refer to the installation manual of the outdoor unit for the address setting to HR unit rotary switch for HR units
Upgraded 485 Modem
Upgraded 485 Modem
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Main Reasons
Main reasons
Main reasons
1. Wiring defect between HR unit and up-
graded 485 modem
1. Wiring defect between HR unit and
2. Defect of the upgraded 485 PCB modem 1. Wiring defect between HR unit and
upgraded 485 modem
upgraded 485 modem
3. Defect of the HR unit PCB
2. Defect of the upgraded 485 PCB modem
2. Defect of the upgraded 485 PCB modem
3. Defect of the HR unit PCB
3. Defect of the HR unit PCB
Main Reasons
Main reasons
Main reasons
1. Defect of power cable of HR unit or com-
1. Defect of power cable of HR unit or com-
munication line connection
1. Defect of power cable of HR unit or com-
munication line connection
2. Error of address allocation rotary switch
munication line connection
2. Error of address allocation rotary switch
setting of HR unit
2. Error of address allocation rotary switch
setting of HR unit
3. Defect of the HR unit PCB
setting of HR unit
3. Defect of the HR unit PCB
3. Defect of the HR unit PCB
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LGE Internal Use Only
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