Mitsubishi Electric PUHZ-RP8YHA Technical & Service Manual page 55

<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 circuit 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 circuit board
LED1 (Green) LED2 (Red)
1 blinking 2 blinking Connector(63L) is open.
Connector(63H) is open.
2 connectors are open.
Mis-wiring of indoor/outdoor unit conne-
2 blinking 1 blinking
cting wire, excessive number of indoor
units (5 units or more)
Mis-wiring of indoor/outdoor unit co-
nnecting wire (converse wiring or di-
sconnection)
Startup time over
Indoor/outdoor unit communication error
2 blinking
(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
Error 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 high prior
signal(M-NET)
W1.Remote controller displays error code.
W2.Refer to service manual for indoor unit.
Outdoor controller circuit board
LED1 (Green) LED2 (Red)
Lighted Lighted
Lighted Not lighted
Lighted Not lighted
Lighted Lighted
Error
Contents
code
w1
F3
F5
F9
—
—
—
E6
E7
—
—
E0
E3
E4
E5
EF
Ed
A0~A8
55
Error code
00, etc.
08, etc.
C5, H7 etc.
Error
Inspection method
1Check if connector (63L or 63H) on the outdoor controller
board is not disconnected.
2Check continuity of pressure switch (63L or 63H) by tester.
1Check if indoor/outdoor connecting wire is connected correctly.
2Check if 5 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 circuit
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.
1Check if remote controller is MA remote controller(PAR-20MAA).
2Check if noise entered into transmission wire of remote controller.
3Check if noise entered into indoor/outdoor connecting wire.
4Re-check error by turning off power, and on again.
1Check if connector (CN4) on outdoor controller circuit board
and outdoor power circuit board is not disconnected.
2Check if there is poor connection of connector on outdoor
controller circuit board(CNMNT and CNVMNT).
3Check M-NET communication signal.
A-Control Service Tool
Indication of the display
Alternately blinking display
Operation mode
Detailed
reference
page
P.32
P.32
P.32
P.33
P.33
P.33
w2
w2
P.37
P.37
P.37
P.37
w2
w2
P.37
P.37
P.38~
P.41