23
Error Code
Abnormal point and detection method
Judgment and action
Case
E9
Interface unit/Flow temp. controller
or 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
fi
nd blank of transmis-
sion path for 3 minutes.
1
Interface unit/Flow temp. con-
troller or outdoor unit connect-
ing wire has contact failure.
2
Defective communication circuit
of outdoor controller circuit
board
3
Noise has entered power sup-
ply.
4
Noise has entered Interface
unit/Flow temp. controller or
outdoor unit connecting wire.
1
Check disconnection or looseness of Inter-
face unit/Flow temp. controller or 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 de
fi
ned error code
This code is displayed when non de
fi
ned
error 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/FTC or outdoor control-
ler 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 be-
tween the outdoor controller
circuit board and the outdoor
power circuit board
2
Wire disconnection or contact
failure of connector CN4 be-
tween 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 or
outdoor unit communication error (Sig-
nal receiving error)
(Outdoor unit)
(1) Abnormal if outdoor controller circuit
board could not receive anything nor-
mally for 3 minutes.
1
Contact failure of Interface unit/
Flow temp. controller or outdoor
unit connecting wire
2
Defective communication circuit
of outdoor controller circuit
board
3
Defective communication circuit
of Interface unit/Flow temp.
controller
4
Noise has entered into Inter-
face unit/Flow temp. controller
or outdoor unit connecting wire.
1
Check disconnection or looseness of Inter-
face unit/Flow temp. controller or 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 PCB of Interface unit/
Flow temp. controller or outdoor control-
ler circuit board if abnormality is dis-
played again.
