LG MULTI V Service Manual page 144

Self-diagnosis function
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 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 220 V has been changed each other,
communication parts and indoor will be burnt
HR Unit PCB (PRHR**2(A))
#1 valve housing
SW02M
(Dip switch for setup of
The function of HR unit)
HR Unit PCB (PRHR**3(A))
Branch #1~4
Bypass
(from left)
7-SEG
Liquid Bypass
Valve
SW03M
SC EEV
Branch #3,4
High/Low
(from top)
Branch #1,2
High/Low
(from top)
- SW01D/SW01C/
SW02B/SW01B/SW02E
- SW01E : Branch #1~4
(from SW No.1)
#4 valve housing
SW04M
Branch #5~8
Bypass
(from left)
7-SEG
- SW02E : Use only SW No.5
- SW01E : Branch #5~8
(from SW No.1)
- SW01C
- 144 -
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All rights reserved. Only training and service purposes.
7-SEG
SW05M
SW01M
SW01M/SW03M/SW04M
(Switch for manual valve
addressing)
Branch #7,8
High/Low
(from top)
Branch #5,6
High/Low
(from top)