LG MULTI V 5 Manual Book page 44

Error
Error Type Error Point
Error No. Error Type Error Point
No.
Indoor BLDC fan motor
Indoor unit BLDC fan motor
Indoor unit BLDC fan
Indoor BLDC fan motor
10 feedback signal is ab-
failure
10 motor failure feedback signal is absent
sent (for 50 sec.)
(for 50 sec.)
n Error diagnosis and countermeasure flow chart
Is connector No
Connect properly
connection proper?
Yes
No
Is fan motor
Replace indoor unit fan motor
normal?*
Yes
Replace indoor unit PCB **
* It is normal when check hall sensor of indoor fan motor as shown below
Each termainl with the tester
Tester
+ -
1 4
5
4
6 4
7 4
1 4 5 6 7
<Checking connection state of fan motor connector>
** Replace the indoor unit PCB, and then make sure to do Auto addressing and input the
address of central control
WARNING
• The connection of motor connector to PCB should be done under no power supplying to PCB.
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
086
_TROUBLE SHOOTING GUIDE BOOK
Main Reasons
Main Reasons
1. Motor connector connection fault
1. Motor connector connection fault
2. Indoor PCB fault
2. Indoor PCB fault
3. Motor fault
3. Motor fault
Normal resistance(±10%)
TH chassis TD chassis
∞ ∞
hundreds kΩ hundreds kΩ k
∞ ∞
hundreds kΩ hundreds kΩ
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LGE Internal Use Only
Error No. Error Type Error Point
Error
Error Type Error Point
No.
No signal commu-
Indoor unit & nication
11 inverter PCB com- No signal communication between indoor
Indoor unit & inverter PCB
11 between indoor unit &
munication error unit &
communication error
inverter PCB
inverter PCB
n Error diagnosis and countermeasure flow chart
Does error occur after verifying
NO
Check connection status and wiring
PI485 communication board
status, and take action **
connection status?
YES
NO
Does error occur after replacing
Replace PI485 communication board
PI485 communication board?
YES
NO
Does error occur after
Replace main PCB ***
replacing main PCB?
YES
Replace inverter PCB
* When there is no service wired remote controller : Use the next indoor unit wired remote controller.
** Check cable status: It usually occurs when connection is defective or remote controller cable is extended and
connected for use. Check the ambient noise effect (check distance from power cable), and
take distance from device generating EMI.
*** After replacing indoor unit PCB, perform auto addressing, and when there is a central controller, input indoor
unit central control address.
(Newly perform auto addressing while power is applied to all the connected indoor units.)
Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Self-diagnosis Function
Main Reasons
Main Reasons
1. Wired remote controller fault
2. Indoor unit PCB fault
1. Wired remote controller fault
3. Inverter PCB fault
2. Indoor unit PCB fault
4. PI485 communication board fault 3. Inverter PCB fault
5. Connector connection and contact defect 4. PI485 communication board fault
5. Connector connection and contact defect
6. Cabled remote controller communication
6. Cabled remote controller communication
defect
defect
7. PI485 communication cable defect
7. PI485 communication cable defect
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LGE Internal Use Only
087
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