41
OCH737
Check Code Abnormal points and detection method
Cause
Judgment and action
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 any signal for 2 minutes.
(Check code: E0)
3
Abnormal if indoor controller board can
not receive normally any data from remote
controller board or from other indoor con-
troller board for 3 minutes. (Check code:
E4)
4
Indoor controller board cannot receive any
signal from remote controller for 2 min-
utes. (Check code: E4)
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 address “0”
6
Noise has entered into the trans-
mission wire of remote controller.
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 con-
troller: maximum 2 units
If the cause of trouble is not any of
1
–
3
above,
4
Diagnose remote controllers.
a) When “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 “NG” is displayed, replace remote
controller.
c) When “E3” or “ERC” is displayed, noise
may be causing abnormality.
Note: If the unit is not normal after replacing indoor
controller board in group control, indoor con-
troller board of address “0” may be abnormal.
E1
or
E2
Remote controller control board
1
Abnormal if data cannot be normally read
from the nonvolatile memory of the remote
controller control board.
(Check code: E1)
2
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
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)
3
Abnormal if indoor controller board could
not find blank of transmission path.
(Check code: E5)
4
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
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.
1
Set a remote controller to main, and the
other to sub.
2
Remote controller is connected with only 1
indoor unit.
3
The address changes to a separate
setting.
4
−
6
Diagnose remote controller.
a) When “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 “NG” is displayed, replace remote
controller.
c) When “E3” or “ERC” is displayed, noise
may be causing abnormality.
