Display Function Of Inspection For Outdoor Unit; Normal Condition; Abnormal Condition - Mitsubishi Electric SUZ-KA24NAHZ Service Manual

<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
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 LED2
(Green) (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 (converse wiring or disconnection)
Startup time over
2 blinking Indoor/outdoor unit communication error
(signal receiving error) is detected by
indoor 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 Check code is not defined.
5 blinking Serial communication error
< C o m m u n i c a t i o n b e t w e e n o u t d o o r
controller board and outdoor power board>
< C o m m u n i c a t i o n b e t w e e n o u t d o o r
controller board and M-NET P.C. board>
Communication error of M-NET system
*Check code displayed on remote controller
**Refer to service manual for indoor unit.
OCH754A
Outdoor controller board
LED1 (Green) LED2 (Red)
Lit
Lit
Lit
Lit
Check
Contents
code*
F5
—
—
—
E6
E7
—
—
E0
E3
E4
E5
EF
Ed
A0-A8
63
Check code
Lit
Not lit 00, etc.
Not lit 08, etc.
Lit C5, H7, etc.
Error
Inspection method
Check if connector (63H) on the outdoor controller board
1
is not disconnected.
Check continuity of pressure switch (63H) by tester.
2
Check if indoor/outdoor connecting wire is connected
1
correctly.
Check if 4 or more indoor units are connected to outdoor
2
unit.
Check if noise entered into indoor/outdoor connecting wire
3
or power supply.
Re-check error by turning off power, and on again.
4
Check if indoor/outdoor connecting wire is connected
1
correctly.
Check if noise entered into indoor/outdoor connecting wire
2
or power supply.
Check if noise entered into indoor/outdoor controller
3
board.
Re-check error by turning off power, and on again.
4
Check if connecting wire of indoor unit or remote controller
1
is connected correctly.
Check if noise entered into transmission wire of remote
2
controller.
Re-check error by turning off power, and on again.
3
Check if noise entered into transmission wire of remote
1
controller.
Check if noise entered into indoor/outdoor connecting
2
wire.
Re-check error by turning off power, and on again.
3
Check if connector (CN4) on outdoor controller board and
1
outdoor power board is not disconnected.
Check if there is poor connection of connector on outdoor
2
controller board(CNMNT and CNVMNT).
Check M-NET communication signal.
3
A-Control Service Tool
Indication of the display
Alternately blinking display
Operation mode
Continue to the next page.
Detailed
reference
page
P.27
P.27
(EA)
P.27
(Eb)
P.27
(EC)
**
**
P.33
(E8)
P.33
(E9)
P.32
P.33
P.32
P.33
P.34
P.34
P.36-P.39