LG MULTIV III Service Manual page 40

Self-diagnosis function
Error No.
Transmission error
204C#HR
between the HR unit
and outdoor unit
■ 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 con-
dition 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
Green LED blinking:
communication is normal
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Only for training and service purposes
Error type
Transmission error between
the HR unit and outdoor unit
Error point
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
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Main reasons
LGE Internal Use Only