20
21
OCH724
Check Code
Abnormal point and detection method
Cause
Countermeasure
E0
or
E4
Remote controller transmission error/
signal receiving error (E0/E4)
1
Abnormal if main or sub remote controller
cannot receive any transmission
normally from indoor unit of refrigerant
address “0” for 3 minutes.
(Check code: E0)
2
Abnormal if sub remote controller could
not receive any signal for 2 minutes.
(Check code: E0)
1
Abnormal if indoor controller board can
not receive any data normally from
remote controller board or from other
indoor controller board for 3 minutes.
(Check code: E4)
2
Indoor controller board cannot receive
any signal from remote controller for 2
minutes. (Check code: E4)
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: maximum 500 m
(Do not use cable with 3 or more cores.)
• The number of connecting indoor units:
maximum 16 units
• The number of connecting remote
controller: maximum 2 units
•
When using 2 remote controllers, the
maximum wiring length for the remote
controller cables is 200 m.
If the cause of trouble is not any of
1
–
3
above,
4
Diagnose remote controllers.
a) When “RC OK” is displayed,
remote controllers have no problem.
Turn the power off, and on again to check.
If abnormality occurs 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.
Note: If the unit is not normal after replacing
indoor controller board in group control,
indoor controller board of address “0”
may be abnormal.
E3
or
E5
Remote controller transmission error/
signal transmitting error(E3/E5)
1
Abnormal if remote controller could not
find blank of transmission path for 6
seconds and could not transmit.
(Check code: E3)
2
Remote controller receives transmitted
data at the same time and compares the
received and transmitted data. Abnormal
if these data are judged to be different
30 continuous times. (Check code: E3)
1
Abnormal if indoor controller board could
not find blank of transmission path.
(Check code: E5)
2
Indoor controller board receives
transmitted data at the same time and
compares the received and transmitted
data. Abnormal if these data are judged
to be different 30 continuous times.
(Check code: E5)
1
Set a remote controller to main, and the
other to sub.
2
Remote controller must be connected with
only one indoor unit.
3
The address must be set to a separate
setting.
4
–
6
Diagnose remote controller.
a) When “RC OK” is displayed, remote
controllers 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.
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 controller
circuit board.
3
Miswiring of remote controller
4
Defective transmitting receiving
circuit of remote controller
5
Defective transmitting receiving
circuit of indoor controller board
of refrigerant addresses “0”.
6
Noise has entered into the
transmission wire of remote
controller.
1
2 remote controllers are set as
“main.”
(In the case of 2 remote controllers)
2
Remote controller is connected
with 2 indoor units or more.
3
Repetition of refrigerant
address
4
Defective transmitting receiving
circuit of remote controller
5
Defective transmitting receiving
circuit of indoor controller board
6
Noise has entered into
transmission wire of remote
controller.
E6
1
Contact failure, short circuit, or
miswiring (reversed wiring) of
indoor/outdoor unit connecting
wire
2
Defective transmitting receiving
circuit of indoor controller board
3
Defective transmitting receiv
-
ing circuit of outdoor controller
board
4
Noise has entered into indoor/
outdoor unit connecting wire.
Note: Check LED display on the outdoor
control circuit board. (Connect A-control
service tool, PAC-SK52ST).*1
Refer to outdoor unit service manual.
1
Check disconnection or looseness of indoor/
outdoor unit connecting wire.
Check all the units in the case of twin/triple
indoor unit system.
2
–
4
Turn the power off, and on again to
check. If abnormality occurs again,
replace indoor controller board or outdoor
controller board.
Note: Other indoor controller board may have
defect in the case of twin/triple indoor
unit system.
Indoor/outdoor unit communication
error (Signal receiving error)
1
Abnormal if indoor controller board can
not receive any signal normally for 6
minutes after turning the power on.
2
Abnormal if indoor controller board can
not receive any signal normally for 3
minutes.
3
Consider the unit abnormal under the
following condition: When 2 or more
indoor units are connected to an outdoor
unit, indoor controller board cannot
receive a signal for 3 minutes from
outdoor controller circuit board, a signal
which allows outdoor controller circuit
board to transmit signals.
*1: only P-series outdoor unit
