Mitsubishi Electric PAA-A18AA1 Service Manual page 47

Error Abnormal point and detection method
Code
E0 Remote controller transmission error (E0) / signal receiving
error (E4)
(6831)
or
1. Abnormal if main or sub remote controller can not receive
E4
normally any transmission from indoor unit of refrigerant
(6834)
address "0" for three minutes. (Error code: E0)
2. Abnormal if sub remote controller could not receive for any
signal for two minutes. (Error code: E0)
3. Abnormal if indoor controller board can not receive normally
any data from remote controller board or from other indoor
controller board for three minutes. (Error code: E4)
4. Indoor controller board cannot receive any signal from re-
mote controller for two minutes. (Error code: E4)
E3 Remote controller transmission error (E3) / signal receiving
error (E5)
(6201)
or
1. Abnormal if remote controller could not find blank of trans-
E5
mission path for six seconds and could not transmit. (Error
(6203)
code: E3)
2. Remote controller receives transmitted data at the same
time, compares the data, and when detecting it, judges
different data to be abnormal 30 continuous times. (Error
code: E3)
3. Abnormal if indoor controller board could not find blank of
transmission path. (Error code: E5)
4. 2 Indoor controller board receives transmitted data at the
same time, compares the data,and when detecting it, judges
different data to be abnormal 30 continuous times. (Error
code: E5)
E6 Indoor/outdoor unit communication error (Signal receiving error)
(6840)
1. Abnormal if indoor controller board cannot receive any sig-
nal normally for six minutes after turning the power on.
2. Abnormal if indoor controller board cannot receive any sig-
nal normally for three minutes.
3. Consider the unit as abnormal under the following condition:
When two or more indoor units are connected to an outdoor
unit, indoor controller board cannot receive a signal for three
minutes from outdoor controller circuit board, a signal which
allows outdoor controller circuit board to transmit signals.
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
Cause
1. Contact failure at transmis-
sion wire of remote control-
ler
2. All remote controllers are
set as "sub" remote control-
ler. In this case, E0 is dis-
played on remote control-
ler, and E4 is displayed
at LED (LED 1, LED 2)
on the outdoor controller
circuit board.
3. Miswiring of remote con-
troller
4. Defective transmitting re-
ceiving circuit of remote
controller
5. Defective transmitting re-
ceiving circuit of indoor
controller board of refriger-
ant address "0"
6. Noise has entered into the
transmission wire of remote
controller
1. Two remote controller are
set as "main." (In case of 2
remote controllers)
2. Remote controller is con-
nected with two indoor
units or more
3. Repetition of refrigerant ad-
dress
4. Defective transmitting re-
ceiving circuit of remote
controller
5. Defective transmitting re-
ceiving circuit of indoor
controller board
6. Noise has entered into
transmission wire of remote
controller.
1. Contact failure, short circuit
or, miswiring (converse wir-
ing) of indoor/outdoor unit
connecting wire
2. Defective transmitting re-
ceiving circuit of indoor
controller board
3. Defective transmitting re-
ceiving circuit of indoor
controller board
4. Noise has entered into in-
door/ outdoor unit connect-
ing wire
47
Countermeasure
1. Check disconnection or looseness of indoor
unit or transmission wire of remote controller.
2. Set one of the remote controllers "main". If
there is no problem with the action above.
3. Check wiring of remote controller. • Total
wiring length: max. 500 m (Do not use cable 53
or more)
• The number of connecting indoor units: max.
16 units
• The number of connecting remote controllers:
max. 2 units
When it is not the above-mentioned problem
of 1~3
4. Diagnose remote controllers.
a) When "RC OK" is displayed, Remote control-
lers have no problem. Turn the power off, and on
again to check. If abnormality generates again,
replace indoor controller board.
b) When "RC NG" is displayed, Replace remote
controller.
c) When "RC E3" is displayed,
d) When "ERC 00-06" is displayed,
[ c), d)→Noise may be causing abnormality. ]
∗ If the unit is not normal after replacing indoor
controller board in group control, indoor control-
ler board of address "0" may be abnormal.
1. Set a remote controller to main, and the other
to sub
2. Remote controller is connected with only one
indoor unit
3. The address changes to a separate setting
4~6. Diagnose remote controller
a) When "RC OK" is displayed, remote control-
lers have no problem. Turn the power off, and on
again to check. When becoming abnormal again,
replace indoor controller board.
b) When "RC NG" is displayed, replace remote
controller.
c) When "RC E3" or "ERC 00-66" is displayed,
noise may be causing abnormality.
∗ Check LED display on the outdoor control cir-
cuit board. (Connect A-control service tool, PAC-
SK52ST.)
Refer to EA-EC item if LED displays EA-EC.
1. Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor unit or
outdoor unit. Check all the units in case of twin
triple 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 cir-
cuit board.
∗ Other indoor controller board may have defect
in case of twin triple indoor unit system.
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