64
1 blink
2 blinks
LED1
(Green)
LED2
(Red)
1 blink
2 blinks
1 blink
2 blinks
3 blinks
4 blinks
•Negative phase detection
•The wires of power supply and connecting
wires of indoor / outdoor units are crossed
with one another.
•51CM connector open
•Start-up time is up.
•Indoor / outdoor unit connector mis-wiring
•Excessive numbers of indoor units per an
outdoor unit (five or more)
•Miswiring of indoor / outdoor unit connection
wires (crossed wiring or disconnection)
•Indoor / outdoor unit transmission error
(Transmitting error: Outdoor controller side)
•Indoor / outdoor unit transmission error
(Signal receiving error: Indoor controller side)
•Indoor / outdoor unit transmission error
(Transmitting error: Indoor controller side)
•Indoor / outdoor unit transmission error
(Signal receiving error :Outdoor controller side)
•Remote controller transmission error
(Transmitting error: Indoor controller side)
•Undefined error code
•Remote controller transmission error
(Signal receiving error: Remote controller side)
•Remote controller transmission error
(Transmitting error: Remote controller side)
•Remote controller transmission error
(Signal receiving error: Indoor controller side)
Check if the wires of power supply are connected to their
corresponding terminals on TB1.
Check if the wirings are correct on power supply (TB1) and
outdoor power supply board (TB2).
Check if the wirings are correct on the connecting wires of
indoor / outdoor units.
Check if a single outdoor unit connects 5 or more indoor
units.
Check if the connectors of 51CM (51C) on
outdoor controller board are disconnected.
Check the continuity of connector 51CM (51C) with a tester.
•63L connector open
Check connection of 63L(63L) connector on outdoor
controller
board.
Check the 63L side of connecting wire.
Check refrigerant pressure.
Charge additional refrigerant.
Check continuity with a tester.
Replace outdoor controller board.
Replace outdoor controller board.
Check if the wirings are correct on indoor units or remote
controllers.
Check if there is noise on the transmission lines of remote
controllers.
Turn the power off and let the units operate again to confirm.
Check if there is noise on the transmission lines of remote
controllers.
Check if there is noise on the connecting wires of
indoor/outdoor units.
Turn the power off and let the units operate again to confirm.
To be continued on the next page.
Check if the wirings are correct on the connecting wires of
indoor / outdoor units.
Check if there is noise on the wires of power supply and
connecting wires of indoor / outdoor units.
Check if there is noise on both indoor and outdoor
controller board.
Turn the power off and let the units operate again to confirm.
Indication (O.B)
Error Name
Inspection method
LED1 (Green)
LED2 (Red)
<Display function of inspection for outdoor unit>
• The blinking patterns of two LEDs—LED1(Green) and LED2(Red)—show the diagnoses of troubles in case of malfunction.
• By 7SEG indicator board indicates the operation mode and inspection types.
OC379F
