Indoor/Outdoor Unit Communication Error (Signal Receiving Error); Non Defined Error Code; Serial Communication Error - Mitsubishi Electric PUZ-A18NHA4 Service Manual
Split-type, heat pump air conditioners outdoor unit
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- Technical data manual (104 pages) ,
- Service manual (12 pages) ,
- Service manual (132 pages)
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Abnormal point and detection method
Error Code
Indoor/outdoor unit communication
error (Signal receiving error)
1 Abnormal if indoor controller board could
not receive any signal normally for 6
minutes after turning the power on.
2 Abnormal if indoor controller board could
not receive any signal normally for 3
minutes.
3 Consider the unit as abnormal under
the following condition; When 2 or more
indoor units are connected to an out-
E6
door unit, indoor controller board could
not receive a signal for 3 minutes from
(6840)
outdoor controller circuit board, a signal
which allows outdoor controller circuit
board to transmit signals.
Indoor/outdoor unit communication
error (Signal receiving error)
(Outdoor unit)
E8
(1) Abnormal if outdoor controller circuit
(6840)
board could not receive anything
normally for 3 minutes.
Indoor/outdoor unit communication
error (Transmitting error) (Outdoor unit)
(1) Abnormal if "0" receiving is detected 30
times continuously though outdoor con-
E9
troller circuit board has transmitted "1".
(6841)
(2) Abnormal if outdoor controller circuit
board could not find blank of transmission
path for 3 minutes.
Non defined error code
This code is displayed when non defined
error code is received.
EF
(6607
or
6608)
Serial communication error
1. Abnormal if serial communication
between outdoor controller circuit
board and outdoor power circuit board
is defective.
Ed
(0403)
2. Abnormal if communication between
outdoor controller circuit board and
M-NET board is not available.
Case
1 Contact failure, short circuit or
miswiring (converse wiring) of
indoor/outdoor unit connecting
wire
2 Defective transmitting receiv-
ing circuit of outdoor controller
circuit board
3 Defective transmitting receiving
circuit of indoor controller board
4 Noise has entered into indoor/
outdoor unit connecting wire.
5 Defective fan motor
6 Defective rush current resistor
1 Contact failure of indoor/out-
door unit connecting wire
2 Defective communication circuit
of outdoor controller circuit board
3 Defective communication circuit
of indoor controller board
4 Noise has entered into indoor/
outdoor unit connecting wire.
1 Indoor/outdoor unit connecting
wire has contact failure.
2 Defective communication circuit
of outdoor controller circuit board
3 Noise has entered power supply.
4 Noise has entered indoor/out-
door unit connecting wire.
1 Noise has entered transmission
wire of remote controller.
2 Noise has entered indoor/out-
door unit connecting wire.
3 Outdoor unit is not a power-
inverter models.
4 Model name of remote control-
ler is PAR-S25A.
1 Breaking of wire or contact
failure of connector CN2
between the outdoor controller
circuit board and the outdoor
power circuit board
2 Breaking of wire or contact
failure of connector CN4
between the outdoor controller
circuit board and the outdoor
power circuit board
3 Defective communication circuit
of outdoor power circuit board
4 Defective communication circuit
of outdoor controller circuit board
for outdoor power circuit board
1 Breaking of wire or contact
failure of connector between
outdoor controller circuit board
and M-NET board
2 Contact failure of M-NET board
power supply line
3 Noise has entered into M-NET
transmission wire.
41
Judgment and action
w Check LED display on outdoor controller
circuit board. (Connect A-Control service tool
(PAC-SG50ST))
Refer to EA~EC item if LED displays EA~AC.
1 Check disconnecting or looseness of indoor
/outdoor unit connecting wire of indoor unit
or outdoor unit.
Check all the units in case of twin indoor unit
system.
2~4 Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board or outdoor controller
circuit board.
5 Turn the power off, and detach fan motor from con-
nector (CNF1,2). Then turn the power on again.
If abnormality is not displayed, replace fan motor.
If abnormality is displayed, replace outdoor
controller circuit board.
6 Check RS1 on outdoor noise filter board with
tester. If open is detected, replace the board.
w Other indoor controller board may have
defect in case of twin indoor unit system.
1 Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor or out-
door units.
2~4 Turn the power off, and on again to
check. Replace indoor controller board or
outdoor controller circuit board if abnormal-
ity is displayed again.
1 Check disconnection or looseness of indoor/
outdoor unit connecting wire.
2~4 Turn the power off, and on again to
check. Replace outdoor controller circuit
board if abnormality is displayed again.
12 Turn the power off, and on again to check.
Replace indoor controller board or outdoor
controller circuit board if abnormality is
displayed again.
3 Replace outdoor unit with power-inverter type
outdoor unit.
4 Replace remote controller with MA remote
controller.
12 Check connection of each connector CN2
and CN4 between the outdoor controller
circuit board and the outdoor power circuit
board.
3 Replace outdoor power circuit board.
4 Replace outdoor controller circuit board.
1 Check disconnection, looseness, or breaking of
connection wire between outdoor controller cir-
cuit board (CNMNT) and M-NET board (CN5).
2 Check disconnection, looseness, or breaking of
connection wire between outdoor controller cir-
cuit board (CNMNT) and M-NET board (CND).
3 Check M-NET transmission wiring method.
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