Mitsubishi Electric PUZ-WM50VHA Service Manual page 30

Check code Abnormal points and detection method
Remote controller control board
1 Abnormal if data cannot be normally
E1
read from the nonvolatile memory of the
or
remote controller control board.
E2
(Check code: E1)
(6201
2 Abnormal if the clock function of remote
or
controller cannot be normally operated.
6202)
(Check code: E2)
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
E3
data at the same time, compares the
or data, and when detecting it, judges
different data to be abnormal 30
E5
continuous times. (Check code: E3)
(6832
or
1 Abnormal if indoor controller board could
6833)
not find blank of transmission path.
(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
E8 could not receive anything normally for 3
minutes.
(6840)
Indoor/outdoor unit communication error
(Transmitting error) (Outdoor unit)
1 Abnormal if "0" receiving is detected
E9 30 times continuously though outdoor
controller circuit board has transmitted "1".
(6841)
2 Abnormal if outdoor controller
circuit board could not find blank of
transmission path for 3 minutes.
Non defined check code
EF This code is displayed when non defined
check code is received.
(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)
OCH727
Cause
1 Defective remote controller
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
30
judgment and action
1 Replace remote controller.
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.