Mitsubishi Electric PAC-IF012B Technical Manual page 80

Error Code Abnormal point and detection method
FTC/outdoor unit communication error
(Signal receiving error)
(Outdoor unit)
(1) Abnormal if outdoor controller circuit
board could not receive anything
normally for 3 minutes.
E8
FTC/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".
E9
(2) Abnormal if outdoor controller circuit
board could not fi nd blank of transmis-
sion path for 3 minutes.
Non defi ned error code
This code is displayed when non defi ned
error code is received.
EF
Serial communication error
Abnormal if serial communication between
outdoor controller circuit board and outdoor
power circuit board is defective.
Ed
Case
1 Contact failure of FTC/outdoor
unit connecting wire
2 Defective communication circuit
of outdoor controller circuit
board
3 Defective communication circuit
of FTC
4 Noise has entered into FTC/
outdoor unit connecting wire.
1 FTC/outdoor unit connecting
wire has contact failure.
2 Defective communication circuit
of outdoor controller circuit
board
3 Noise has entered power sup-
ply.
4 Noise has entered FTC/outdoor
unit connecting wire.
1 Noise has entered transmission
wire of remote controller.
2 Noise has entered Interface
unit/Flow temp. controller-
outdoor unit connecting wire.
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
80
Judgment and action
1 Check disconnection or looseness of FTC/
outdoor unit connecting wire of FTC or out-
door unit.
2~4 Turn the power off, and on again to
check. Replace PCB of FTC or outdoor
controller circuit board if abnormality is
displayed again.
1 Check disconnection or looseness of FTC/
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.
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.
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.