Mitsubishi Electric TRANE NTXAMT12A112AA Service Manual page 48

Error Abnormal point and detection method
Code
E0 Remote controller transmission error(E0)/signal receiving
error(E4)
or
E4
1. Abnormal if main or sub remote controller can not receive
normally any transmission from indoor unit of refrigerant
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)
1. Abnormal if indoor controller board can not receive nor-
mally any data from remote controller board or from other
indoor controller board for three minutes. (Error code: E4)
2. Indoor controller board cannot receive any signal from
remote controller for two minutes. (Error code: E4)
E3 Remote controller transmission error(E3)/signal receiving
error(E5)
or
E5
1. Abnormal if remote controller could not find blank of trans-
mission path for six seconds and could not transmit. (Error
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)
1. Abnormal if indoor controller board could not find blank of
transmission path. (Error code: E5)
2. 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)
1. Abnormal if indoor controller board cannot receive any
signal normally for six minutes after turning the power on.
2. Abnormal if indoor controller board cannot receive any
signal normally for three minutes.
3. Consider the unit as abnormal under the following condi-
tion: When two or more indoor units are connected to an
outdoor unit, indoor controller board cannot receive a sig-
nal 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.
NTXAMT12, 18, 24, 30, 36A112AA
Cause
1. Contact failure at transmission
wire of remote controller
2. All remote controllers are set
as "sub" remote controller. In
this case, E0 is displayed
on remote controller, and E4
is displayed at LED (LED1,
LED2) on the outdoor control-
ler circuit board.
3. Mis-wiring of remote controller
4. Defective transmitting receiv-
ing circuit of remote controller
5. Defective transmitting receiv-
ing circuit of indoor controller
board of refrigerant 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
con- trollers)
2. Remote controller is connected
with two indoor units or more
3. Repetition of refrigerant ad-
dress
4. 4 Defective transmitting receiv-
ing circuit of remote controller
5. Defective transmitting receiv-
ing circuit of indoor controller
board
6. Noise has entered into trans-
mission wire of remote control-
ler.
1. Contact failure, short circuit or,
mis-wiring (converse wiring) of
indoor/outdoor unit connecting
wire
2. Defective transmitting receiv-
ing circuit of indoor controller
board
3. Defective transmitting receiv-
ing circuit of indoor controller
board
4. Noise has entered into indoor/
outdoor unit connecting wire
48 © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
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.500m (Do not use cable 5 3
or more)
• The number of connecting indoor units:
max.16units
• The number of connecting remote controller:
max.2units
When it is not the above-mentioned problem
of 1~3
4. Diagnose remote controllers.
a) When "RC OK" is displayed, Remote con-
trollers have no problem. Turn the power off,
and on again to check. If abnormality gener-
ates again, replace indoor controller board.
b) When "RC NG" is displayed, Replace re-
mote 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 con-
troller 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
circuit board. (Connect A-control service tool,
PAC-SK52ST.)
Refer to EA-EC item if LED displays EA-EC.
1. Check disconnection or looseness of in-
door/ 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
circuit board.
∗ Other indoor controller board may have de-
fect in case of twin triple indoor unit system.