Pressure Switch; Main Pcb - LG MULTI V 5 Manual Book

12. Pressure Switch

Checking start
In the pressure
condition that the pressure
Yes
Start operating after cut off the
switch is not working,
power of pressure switch
the compressor is stopped
suddenly?
No
The operation is
normal?
No malfunction of the pressure
Replace the pressure switch
switch
Caution
When the long-term operation to turn off the power of the pressure switch,
you can receive a fatal damage to the components and piping systems.
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_TROUBLE SHOOTING GUIDE BOOK
Yes
No
PCB checking and replacement
Yes

13. Main PCB

13.1 Failure Judge Method
15. Main PCBA
1.1 불량 판단 방법
1. Error code check
1) 에러 코드 확인
Error Code
·Check restart after power reset
-
에러 코드
·Check main PCB power supply.
CH50 ·Check N-phase wrong connection of power supply.
· Check communication PCB (Indoor/Outdoor) connection harness
(24pin), Main
CH05, CH50,
CH53
- External PCB communication harness(6pin, Blue) connection condi-
CH52, CH53,
tion
CH57, CH59,
CH86 ·Check the EEPROM inserting (direction, pin break, etc.) condition
CH86, CH104,
· Check Main - Inverter PCB communication harness(2pin, Blue) wrong
CH52, CH57, CH105
CH105, CH145
connection condition
· Check Main - External PCB communication harness(6pin, Blue) wrong
CH145
connection condition
2) Main PCBA 확인
2. Main PCB check
Check the power line connection status because it is not displayed in 7 segment
· 7세그먼트에 표시되지 않으므로 전원선 연결 상태 확인 (3Pin 파란색 커넥터
Option PCB
FLASH FLASH LG
WRITE (Short Key) MV
220 V
(INPUT)
Pressure
Switch
220 V
(INT)
220 V COMM
(EXT) (485 Comm.) (Power, Comm.)
1.2 주요 불량 원인
· 고전압 인가 (T-N 494 V 이상, N상 오결선 시 CH50 발생)
· 물 침투(컨트롤박스 프론트 판넬 열림 서비스창 열림 컨트롤박스 스크류 풀
Error diagnosis
• 전원 Reset 후 재기동 여부 확인
• Main PCB 전원 인가 확인
• 입력 전원 N상 오결선 여부 확인 후에도 동일 Erro
• 실내외기 통신 PCBA 연결 Harness(24Pin), Main-
• EEPROM 삽입 상태 재확인(방향, 핀 꺽임 등) 후에
• Main-Inverter 통신 Harness(2pin, Blue) 결선 여부
• Main-External 통신 Harness(6pin, Blue) 결선 여부
Series
Comm.
Pipe
Comm.
Leakage
Current
DeBug
EXT
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