25
Check code Abnormal point and detection method
Judgment and action
Case
E9
Interface unit/Flow temp. controller-
outdoor unit communication error
(Transmitting error) (Outdoor unit)
(1) Abnormal if “0” receiving is detected
30 times continuously though outdoor
controller circuit board has transmitted “1”.
(2) Abnormal if outdoor controller
circuit board could not find blank of
transmission path for 3 minutes.
1
Interface unit/Flow temp.
controller-outdoor unit connecting
wire has contact failure.
2
Defective communication circuit
of outdoor controller circuit board
3
Noise has entered power supply.
4
Noise has entered Interface
unit/Flow temp. controller-
outdoor unit connecting wire.
1
Check disconnection or looseness of
Interface unit/Flow temp. controller-outdoor
unit connecting wire.
2
–
4
Turn the power off, and on again to
check. Replace outdoor controller circuit
board if abnormality is displayed again.
EF
Non defined check code
This code is displayed when non defined
check code is received.
1
Noise has entered transmission
wire of remote controller.
2
Noise has entered Interface
unit/Flow temp. controller-
outdoor unit connecting wire.
12
Turn the power off, and on again to check.
Replace Interface/Flow temp. controller
board or outdoor controller circuit board if
abnormality is displayed again.
Ed
Serial communication error
Abnormal if serial communication between
outdoor controller circuit board and outdoor
power circuit board is defective.
1
Wire disconnection or contact
failure of connector CN2
between the outdoor controller
circuit board and the outdoor
power circuit board
2
Wire disconnection or contact
failure of connector CN4
between the outdoor controller
circuit board and the outdoor
power circuit board
3
Defective communication circuit
of outdoor power circuit board
4
Defective communication circuit
of outdoor controller circuit board
for outdoor power circuit board
12
Check connection of each connector CN2
and CN4 between the outdoor controller
circuit board and the outdoor power circuit
board.
3
Replace outdoor power circuit board.
4
Replace outdoor controller circuit board.
E8
Interface unit/Flow temp. controller-
outdoor unit communication error
(Signal receiving error)
(Outdoor unit)
(1) Abnormal if outdoor controller circuit
board could not receive anything
normally for 3 minutes.
1
Contact failure of Interface unit/
Flow temp. controller-outdoor
unit connecting wire
2
Defective communication circuit
of outdoor controller circuit board
3
Defective communication
circuit of Interface/Flow temp.
controller board
4
Noise has entered into Interface
unit/Flow temp. controller-
outdoor unit connecting wire.
1
Check disconnection or looseness of
Interface unit/Flow temp. controller-outdoor
unit connecting wire of Interface unit/Flow
temp. controller or outdoor unit.
2
–
4
Turn the power off, and on again to
check. Replace Interface/Flow temp.
controller board or outdoor controller
circuit board if abnormality is displayed
again.
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
When remote controller receives
the transmitted data same time and
compares these data. Abnormal if the
data is judged to be different for 30
continuous times. (Check code: E3)
1
Abnormal if Interface/Flow temp.
controller board could not find blank of
transmission path. (Check code: E5)
2
When Interface/Flow temp. controller
receives the transmitted data same time
and compares these data. Abnormal if
the data is judged to be different for 30
continuous times. (Check code: E5)
1
Set a remote controller to main, and the
other to sub.
2
–
4
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.”
(In case of 2 remote controllers)
2
Defective transmitting receiving
circuit of remote controller
3
Defective transmitting receiving
circuit of Interface/Flow temp.
controller board
4
Noise has entered into
transmission wire of remote
controller.
E3
or
E5
E6
Interface unit/Flow temp. controller-
outdoor unit communication error
(Signal receiving error)
1
Abnormal if Interface/Flow temp.
controller board cannot receive any
signal normally for 6 minutes after turning
the power on.
2
Abnormal if Interface/Flow temp.
controller board cannot receive any
signal normally for 3 minutes.
1
Contact failure, short circuit
or, miswiring (converse
wiring) of Interface unit/Flow
temp. controller-outdoor unit
connecting wire
2
Defective transmitting receiving
circuit of Interface/Flow temp.
controller board
3
Defective transmitting receiving
circuit of Interface/Flow temp.
controller board
4
Noise has entered into Interface
unit/Flow temp. controller-
outdoor unit connecting wire.
Note: Check LED display on the outdoor
control circuit board. (Connect A-control
service tool, PAC-SK52ST.)
1
Check disconnection or looseness of
Interface unit/Flow temp. controller-outdoor
unit connecting wire of Interface unit/Flow
temp. controller or outdoor unit.
2
–
4
Turn the power off, and on again to check.
If abnormality generates again, replace
Interface/Flow temp. controller board or
outdoor controller circuit board.
OCH465D
