63
OCH754A
<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 con-
nector CNM on outdoor controller board.
[Display]
(1)Normal condition
Unit condition
Outdoor controller board
A-Control Service Tool
LED1 (Green)
LED2 (Red)
Check code
Indication of the display
When the power is turned on
Lit
Lit
Alternately blinking display
When unit stops
Lit
Not lit
00, etc.
Operation mode
When compressor is warming up
Lit
Not lit
08, etc.
When unit operates
Lit
Lit
C5, H7, etc.
(2)Abnormal condition
Indication
Error
Outdoor controller
board
Contents
Check
code*
Inspection method
Detailed
reference
page
LED1
(Green)
LED2
(Red)
1 blinking 2 blinking Connector(63H) is open.
F5
1
Check if connector (63H) on the outdoor controller board
is not disconnected.
2
Check continuity of pressure switch (63H) by tester.
P.27
2 blinking 1 blinking Miswiring of indoor/outdoor unit connecting
wire, excessive number of indoor units (4
units or more)
—
1
Check if indoor/outdoor connecting wire is connected
correctly.
2
Check if 4 or more indoor units are connected to outdoor
unit.
3
Check if noise entered into indoor/outdoor connecting wire
or power supply.
4
Re-check error by turning off power, and on again.
P.27
(EA)
Miswiring of indoor/outdoor unit connecting
wire (converse wiring or disconnection)
—
P.27
(Eb)
Startup time over
—
P.27
(EC)
2 blinking Indoor/outdoor unit communication error
(signal receiving error) is detected by
indoor unit.
E6
1
Check if indoor/outdoor connecting wire is connected
correctly.
2
Check if noise entered into indoor/outdoor connecting wire
or power supply.
3
Check if noise entered into indoor/outdoor controller
board.
4
Re-check error by turning off power, and on again.
**
Indoor/outdoor unit communication error
(transmitting error) is detected by indoor
unit.
E7
**
Indoor/outdoor unit communication error
(signal receiving error) is detected by
outdoor unit.
—
P.33
(E8)
Indoor/outdoor unit communication error
(transmitting error) is detected by outdoor
unit.
—
P.33
(E9)
3 blinking Remote controller signal receiving error is
detected by remote controller.
E0
1
Check if connecting wire of indoor unit or remote controller
is connected correctly.
2
Check if noise entered into transmission wire of remote
controller.
3
Re-check error by turning off power, and on again.
P.32
Remote controller transmitting error is
detected by remote controller.
E3
P.33
Remote controller signal receiving error is
detected by indoor unit.
E4
P.32
Remote controller transmitting error is
detected by indoor unit.
E5
P.33
4 blinking
Check code is not defined.
EF
1
Check if noise entered into transmission wire of remote
controller.
2
Check if noise entered into indoor/outdoor connecting
wire.
3
Re-check error by turning off power, and on again.
P.34
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>
Ed
1
Check if connector (CN4) on outdoor controller board and
outdoor power board is not disconnected.
2
Check if there is poor connection of connector on outdoor
controller board(CNMNT and CNVMNT).
3
Check M-NET communication signal.
P.34
Communication error of M-NET system
A0-A8
P.36-P.39
*Check code displayed on remote controller
**Refer to service manual for indoor unit.
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