Mitsubishi Electric PUHZ-W85VAA Service Manual page 21

Check code Abnormal point and detection method
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
E3
data, and when detecting it, judges
or
different data to be abnormal 30
E5
continuous times. (Check code: E3)
(6832
1 Abnormal if indoor controller board could
or
not find blank of transmission path.
6833)
(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)
Indoor/outdoor unit communication error
(Signal receiving error) (Outdoor unit)
Abnormal if outdoor controller circuit board
could not receive anything normally for 3
minutes.
E8
(6840)
Indoor/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
(6841) circuit board could not find blank of
transmission path for 3 minutes.
Non defined check code
This code is displayed when non defined
check code is received.
EF
(6607
or
6608)
Serial communication error
1 Abnormal if serial communication
between outdoor controller circuit board
and outdoor power circuit board is
defective.
Ed
(0403)
OCH681
Cause
1 Duplication of refrigerant
address
2 Defective transmitting receiving
circuit of remote controller
3 Defective transmitting receiving
circuit of indoor controller board
4 Noise has entered into
transmission wire of remote
controller.
1 Contact failure of indoor/
outdoor unit connecting wire
2 Defective communication circuit
of outdoor controller circuit board
3 Defective communication circuit
of indoor controller board
4 Noise has entered into indoor/
outdoor unit connecting wire.
1 Indoor/ 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 indoor/
outdoor unit connecting wire.
1 Noise has entered transmission
wire of remote controller.
2 Noise has entered indoor/
outdoor unit connecting wire.
3 Outdoor unit is not inverter
models.
1 Breaking of wire or contact
failure of connector CN2
between the outdoor controller
circuit board and the outdoor
power circuit board
2 Breaking of wire 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
21
Judgment and action
1 The address changes to a separate setting.
2–4 Diagnose remote controller (PAC-IF011B-E only).
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.
Note: For the controllers other than PAC-
IF011B-E, refer to Installation Manual
or Service Handbook of the indoor unit.
1 Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor or
outdoor units.
2–4 Turn the power off, and on again to
check. Replace indoor controller board
or outdoor controller circuit board if
abnormality is displayed again.
1 Check disconnection or looseness of indoor/
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 indoor controller board or outdoor
controller circuit board if abnormality is
displayed again.
3 Replace outdoor unit with inverter type
outdoor unit.
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.