Display Function Of Inspection For Outdoor Unit; Abnormal Condition; Normal Condition - Mitsubishi Electric PUHZ-HRP71VHA 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 abnor-
mality 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(63L) is open.
Connector(63H) is open.
2 connectors are open.
Miswiring of indoor/outdoor unit conne-
2 blinking 1 blinking
cting wire, excessive number of indoor
units (4 units or more)
Miswiring 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 M-NET
system
*1. Error code displayed on remote controller
*2. Refer to service manual for indoor unit.
OCH425F
Outdoor controller board
LED1 (Green) LED2 (Red)
Lighted
Lighted Not lighted
Lighted Not lighted
Lighted
Error
Contents
code
*1
F3
F5
F9
—
—
—
E6
E7
—
—
E0
E3
E4
E5
EF
PL
Ed
A0~A8
Error code
Lighted
00, etc.
08, etc.
Lighted C5, H7 etc.
Error
Inspection method
Check if connector (63H or 63L) on the outdoor controller
board is not disconnected.
Check continuity of pressure switch (63H or 63L) by tester.
Check if indoor/outdoor connecting wire is connected correctly.
Check if 4 or more indoor units are connected to outdoor unit.
Check if noise entered into indoor/outdoor connecting wire
or power supply.
Re-check error by turning off power, and on again.
Check if indoor/outdoor connecting wire is connected correctly.
Check if noise entered into indoor/outdoor connecting wire or
power supply.
Check if noise entered into indoor/outdoor controller board.
Re-check error by turning off power, and on again.
Check if connecting wire of indoor unit or remote controller
is connected correctly.
Check if noise entered into transmission wire of remote
controller.
Re-check error by turning off power, and on again.
Check if remote controller is MA remote controller(PAR-21MAA).
Check if noise entered into transmission wire of remote controller.
Check if noise entered into indoor/outdoor connecting wire.
Re-check error by turning off power, and on again.
Be sure to replace the 4-way valve.
Check refrigerant pipes for disconnection or leakage.
After the recovery of refrigerant, vacuum dry the whole
refrigerant circuit.
Refer to section 11-6.
Check refrigerant circuit for operation.
Check if connector (CN4) on outdoor controller board and
outdoor power board is not disconnected.
Check if there is poor connection of connector on outdoor
controller board (CNMNT and CNVMNT).
Check M-NET communication signal.
81
A-Control Service Tool
Indication of the display
Alternately blinking display
Operation mode
Detailed
reference
page
P.40
P.40
P.41
P.41
(EA)
P.41
(Eb)
P.41
(EC)
*2
*2
P.47
(E8)
P.47
(E9)
P.46
P.47
P.46
P.47
P.47
P.48
P.47
P.49-
P.52