21
OCHT669
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
Defective transmitting/receiving
circuit of indoor controller board
Noise has entered into indoor/
outdoor unit connecting wire.
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 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 indoor unit system.
E7
Indoor/outdoor unit communication error
(Transmitting error)
Abnormal if “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.
1
Defective transmitting receiving
circuit of indoor controller board
2
Noise has entered into power
supply.
3
Noise has entered into outdoor
control wire.
1
–
3
Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board.
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.
Consider the unit abnormal under the
following condition: When 2 or more
indoor units are connected to one 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.
Check code
Abnormal point and detection method
Cause
Countermeasure
FB(Fb)
Indoor controller board
Abnormal if data cannot be normally read
from the nonvolatile memory of the indoor
controller board.
1
Defective indoor controller board
1
Replace indoor controller board.
E1
or
E2
(6201
or
6202)
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
(6832
or
6833)
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.
–
Diagnose remote controller.
a) When “RC OK” is displayed, remote con-
trollers 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.”
(In case of 2 remote controllers)
2
Remote controller is connected
with 2 indoor units or more.
Repetition of refrigerant address
Defective transmitting/receiving
circuit of remote controller
Defective transmitting/receiving
circuit of indoor controller board
Noise has entered into transmis-
sion wire of remote controller.
