LG Multi V 5 - Page 59

116 117
_TROUBLE SHOOTING GUIDE BOOK _
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Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. Bad Connection Between Comp PCB and
Comp PCB
2. Communication Wire Noise Effect
3. ODU Main PCB Damage
4. ODU Main PCB Damage
Error
No.
Error Type Error Point Main Reasons
Failing to receive inverter
signal at main PCB of
Outdoor Unit
Communication error : Main
PCB --> Inverter PCB
57*
Master 571
Slave1 572
Slave2 573
Slave3 574
n Error diagnosis and countermeasure flow chart
Are there any
communication wire
connections normal?
Is Inverter PCB
assembly
normal?
Is there any error
when power reset?
Recheck power and
installation condition
1. Check communication wiring conditions
2. Check connector conditions
→ Rewire them if abnormality found.
1. Replace Inverter PCB
1. Replace Main PCB
No
No
No
Yes
Yes
Yes
Communication
LED
Communication
LED
Communication
LED
Communication LED
Fan board Inverter PCB 1 Inverter PCB 2 Main PCB
Error No. Error Type Error Point Main Reasons
57*
Communication er
-
ror : Main PCB →
Inverter PCB
Failing to receive
inverter signal at
main PCB of Out
-
door Unit
1. Bad Connection Between Inverter PCB and
Comp PCB
2. Communication Wire Noise Effect
3. ODU Main PCB Damage
4. ODU Inverter PCB Damage
- 132 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Wiring Fault Case
External PCB
Indoor Unit
Communication PCB
Main PCB
Basic Part
Multi V 5
Intorduction
Trouble Shooting
Function Control
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