32
OCH665B
Check Code
Abnormal points and detection method
Judgment and action
Cause
E0
or
E4
(6831)
Remote controller transmission error
(E0)/signal receiving error (E4)
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)
Abnormal if sub remote controller could not
receive any signal for 2 minutes. (Check
code: E0)
Abnormal if indoor controller board cannot
receive normally any data from remote con-
troller board or from other indoor controller
board for 3 minutes.
(Check code: E4)
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 control-
ler: max. 2 units
If the cause of trouble is not any of
1
–
3
above.
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
occurs again, replace indoor controller
board.
b) When “RC NG” is displayed, replace
remote controller.
c) When “RC E3” or “ERC 00-66” is dis-
played, 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.
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 receiv-
ing circuit of indoor controller
board of refrigerant address “0”
6
Noise has entered into the
transmission wire of remote
controller.
E1
or
E2
Remote controller control board
Abnormal if data cannot be normally read
from the nonvolatile memory of the remote
controller control board.
(Check code: E1)
Abnormal if the clock function of remote
controller cannot be normally operated.
(Check code: E2)
1
Defective remote controller
1
Replace remote controller.
E3
or
E5
(6831)
Remote controller transmission error
(E3)/signal receiving error (E5)
Abnormal if remote controller could not find
blank of transmission path for 6 seconds
and could not transmit.
(Check code: E3)
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)
Abnormal if indoor controller board could
not find blank of transmission path.
(Check code: E5)
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
2 remote controllers are set as
“main.”
(When connecting 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.
