24
Check Code Abnormal point and detection method
Cause
Countermeasure
E0
or
E4
Remote controller transmission
error(E0)/signal receiving error(E4)
1
Abnormal if main or sub remote
controller cannot receive normally
any transmission from indoor unit of
refrigerant address “0” for 3 minutes.
(Check code : E0)
2
Abnormal if sub remote controller could
not receive for 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: max. 500m
(Do not use cable
o
3 or more.)
• The number of connecting indoor units:
max.16 units
• The number of connecting remote
controller: 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
controllers 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” or “ERC 00-06” is displayed,
noise may be causing abnormality.
* 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(E3)/signal receiving error(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, compares the
data, and when detecting it, judges
different data to be abnormal
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,
compares the data,and when detecting
it, judges different data to be abnormal
30 continuous times. (Check code: E5)
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
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.
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 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 (converse wiring) of
indoor/outdoor unit connecting
wire
2
Defective transmitting receiving
circuit of indoor controller board
3
Defective transmitting receiving
circuit of indoor controller board
4
Noise has entered into indoor/
outdoor unit connecting wire.
Check LED display on the outdoor
control circuit board.
Refer to outdoor unit service manual.
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 circuit board.
Note:
Other indoor controller board may have defect
in case of twin triple indoor unit system.
Indoor/outdoor unit communication
error (Signal receiving error)
1
Abnormal if indoor controller board
cannot receive any signal normally for 6
minutes after turning the power on.
2
Abnormal if indoor controller board
cannot 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 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.
OCH551A
