Mitsubishi Electric PUHZ-HRP71VHA Service Manual page 47

Error Code Abnormal point and detection method
Remote controller control board
1 Abnormal if data cannot be normally
read from the nonvolatile memory of the
E1
remote controller control board.
or
(Error code: E1)
E2
2 Abnormal if the clock function of remote
controller cannot be normally operated.
(Error 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.
(Error code: E3)
2 Remote controller receives transmitted
data at the same time, compares the
data, and when detecting it, judges
E3
different data to be abnormal 30
or
continuous times. (Error code: E3)
E5
1 Abnormal if indoor controller board could
not find blank of transmission path.
(Error 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. (Error 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
E8
minutes.
(6840)
Indoor/outdoor unit communication error
(Transmitting error) (Outdoor unit)
1 Abnormal if "0" receiving is detected
30 times continuously though outdoor
E9
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 error code
This code is displayed when non defined
EF error 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)
2 Abnormal if communication between
outdoor controller circuit board and
M-NET board is not available.
OCH425F
Case
1 Defective remote controller
1 2 remote controller are set as
"main."
(In the case of 2 remote
controllers)
2 Remote controller is connected
with 2 indoor units or more.
3 Repetition of refrigerant
address
4 Defective transmitting receiving
circuit of remote controller
5 Defective transmitting receiving
circuit of indoor controller board
6 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.
4 Model name of remote
controller is PAR-S25A.
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
1 Breaking of wire or contact
failure of connector between
outdoor controller circuit board
and M-NET board
2 Contact failure of M-NET board
power supply line
3 Noise has entered into M-NET
transmission wire.
47
Judgment and action
1 Replace remote controller.
1 Set a remote controller to main, and the
other to sub.
2 Remote controller is connected with only one
indoor unit.
3 The address changes to a separate setting.
4~6 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 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.
4 Replace remote controller with MA remote
controller.
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.
1 Check disconnection, looseness, or breaking
of connection wire between outdoor controller
circuit board (CNMNT) and M-NET board (CN5).
2 Check disconnection, looseness, or breaking
of connection wire between outdoor controller
circuit board (CNMNT) and M-NET board (CND).
3 Check M-NET transmission wiring method.