Display Function Of Inspection For Outdoor Unit - Mitsubishi Electric Mr.SLIM PU-P71VHA Service Manual

<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.
Indication (O.B)
LED1 LED2
(Green) (Red)
1 blink 1 blink •Negative phase detection
•The wires of power supply and connecting
wires of indoor / outdoor units are crossed
with one another.
2 blinks
•51CM connector open
•63L connector open
2 blinks 1 blink •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)
•Start-up time is up.
2 blinks
•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)
•Indoor / outdoor unit transmission error
(Transmitting error: Outdoor controller side)
3 blinks •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)
•Remote controller transmission error
(Transmitting error: Indoor controller side)
•Undefined error code
4 blinks
OC379F
Error Name
LED1 (Green)
LED2 (Red)
Inspection method
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 connectors of 51CM (51C) on
outdoor controller board are disconnected.
Check the continuity of connector 51CM (51C) with a tester.
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 the connecting wires of
indoor / outdoor units.
Check if a single outdoor unit connects 5 or more indoor
units.
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.
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.
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