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E6
Contact failure, short circuit or,
miswiring (converse wiring) of
indoor/outdoor unit connecting
wire
Defective transmitting receiving
circuit of outdoor controller
circuit board
Defective transmitting receiving
circuit of indoor controller board
Noise has entered into indoor/
outdoor unit connecting wire.
Check LED display on the outdoor control
circuit board. (Connect A-control service
tool, PAC-SK52ST.)
Refer to EA-EC item if LED displays EA-EC.
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.
- Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board or outdoor
controller circuit board.
Other indoor controller board may have
defect in case of twin indoor unit system.
E7
Indoor/outdoor unit communication
error (Transmitting error)
Abnormal if indoor controller board
receives “1” 30 times continuously when
indoor controller board transmits “0” signal.
Defective transmitting receiving
circuit of indoor controller board
Noise has entered into power
supply.
Noise has entered into outdoor
control wire.
- 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)
Abnormal if indoor controller board
cannot receive any signal normally for 6
minutes after turning the power on.
Abnormal if indoor controller board
cannot receive any signal normally for 3
minutes.
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.
Error Code
Abnormal point and detection method
Cause
Countermeasure
Fb
Indoor controller board
Abnormal if data cannot be read normally
from the nonvolatile memory of the indoor
controller board.
Defective indoor controller
board
Replace indoor controller board.
E1
or
E2
Remote controller control board
Abnormal if data cannot be read nor-
mally from the nonvolatile memory of the
remote controller control board.
(Error code: E1)
Abnormal if the clock function of remote
controller cannot be operated normally.
(Error code: E2)
Defective remote controller Replace remote controller.
E3
or
E5
Remote controller transmission
error(E3)/signal receiving error(E5)
Abnormal if remote controller could not
find blank of transmission path for 6 sec-
onds and could not transmit.
(Error 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. (Error code: E3)
Abnormal if indoor controller board could
not find blank of transmission path.
(Error code: E5)
Indoor controller board receives trans-
mitted data at the same time, compares
the data,and when detecting it, judges
different data to be abnormal 30
continuous times. (Error code: E5)
Set a remote controller to main, and the
other to sub.
Remote controller is connected with only one
indoor unit.
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 dis-
played, noise may be causing abnormal-
ity.
2 remote controllers are set as
“main.”
(In case of 2 remote con-
trollers)
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 trans-
mission wire of remote control-
ler.