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<Display function of inspection for outdoor unit>
The blinking patterns of both LED1 (green) and LED2 (red) indicate the types of abnormality when it occurs. Types of
abnormality can be indicated in details by connecting an optional part 'A-Control Service Tool (PAC-SK52ST)' to connector
CNM on outdoor controller board.
[Display]
(1)Normal condition
Unit condition
When the power is turned on
When unit stops
When compressor is warming up
When unit operates
(2)Abnormal condition
Indication
Outdoor controller
board
LED1 (Green) LED2 (Red)
1 blinking 2 blinking Connector (63H) is open.
2 blinking 1 blinking Miswiring of indoor/outdoor unit
connecting wire, excessive number
of indoor units (4 units or more)
Miswiring of indoor/outdoor unit
connecting wire (reversed wiring or
disconnection)
Startup time over
2 blinking Indoor/outdoor unit communication
error (signal receiving error) is
detected by in door unit.
Indoor/outdoor unit communication
error (transmitting error) is detected
by indoor unit.
Indoor/outdoor unit communication
error (signal receiving error) is
detected by outdoor unit.
Indoor/outdoor unit communication
error (transmitting error) is detected
by outdoor unit.
3 blinking Remote controller signal receiving error is
detected by remote controller.
Remote controller transmitting error
is detected by remote controller.
Remote controller signal receiving
error is detected by indoor unit.
Remote controller transmitting error
is detected by indoor unit.
4 blinking
Abnormal if a connection of indoor unit
and outdoor unit which uses different
refrigerant is detected.
Check code is not defined.
5 blinking Serial communication error <Communication
between outdoor controller board and
outdoor power board>
<Communication between outdoor
controller board and M-NET P.C. board>
Communication error of M-NET system
*1
Check code displayed on remote controller
OCH653C
Outdoor controller board
LED1 (Green)
LED2 (Red)
Lit
Lit
Not lit
Lit
Not lit
Lit
Check
Contents
code
F5
–
–
–
E6
E7
–
–
E0
E3
E4
E5
EE
EF
PL
Ed
A0–A8
Check code
Lit
00, etc.
08, etc.
Lit
C5, H7, etc.
Error
Inspection method
*1
1Check if connector (63H) on the outdoor controller
board is not disconnected.
2Check continuity of pressure switch (63H) by tester.
1Check if indoor/outdoor connecting wire is
connected correctly.
2Check if 4 or more indoor units are connected to
outdoor unit.
3Check if noise entered into indoor/outdoor
connecting wire or power supply.
4Re-check error by turning off power, and on
again.
1Check if indoor/outdoor connecting wire is
connected correctly.
2Check if noise entered into indoor/outdoor
connecting wire or power supply.
3Check if noise entered into indoor/outdoor
controller board.
4Re-check error by turning off power, and on
again.
1Check if connecting wire of indoor unit or remote
controller is connected correctly.
2Check if noise entered into transmission wire of
remote controller.
3Re-check error by turning off power, and on
again.
Check if indoor/outdoor unit combination is
authorized.
1Check if noise entered into transmission wire of remote controller.
2Check if noise entered into indoor/outdoor connecting wire.
3Re-check error by turning off power, and on again.
1Be sure to replace the 4-way valve.
2Check refrigerant pipes for disconnection or
leakage.
3After the recovery of refrigerant, vacuum dry the
whole refrigerant circuit.
4Refer to "10-6. HOW TO CHECK THE PARTS".
5Check refrigerant circuit for operation.
1Check if connector (CN4) on outdoor controller
board and outdoor power board is not
disconnected.
2Check if there is poor connection of connector on
outdoor controller board(CNMNT and CNVMNT).
3Check M-NET communication signal.
72
A-Control Service Tool
Indication of the display
Alternately blinking display
Operation mode
Continue to the next page
Detailed
reference
page
P.37
P.38(EA)
P.38(Eb)
P.38(EC)
P.44
P.44
P.44(E8)
P.44(E9)
P.43
P.44
P.43
P.44
P.45
P.45
P.46
P.45
P.46–P.48
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