Mitsubishi Electric PUZ-ZM200YKA2-ET Service Manual page 48

Check Code Abnormal points and detection method
Indoor/outdoor unit communication error
(Transmitting error) (Outdoor unit)
Abnormal if "0" receiving is detected 30
times continuously though outdoor con-
E9 troller circuit board has transmitted "1".
(6841) Abnormal if outdoor controller circuit board
could not find blank of transmission path for
3 minutes.
Abnormal if a connection of indoor unit
and outdoor unit which uses different
refrigerant is detected.
EE
Non defined check code
This code is displayed when non defined
EF
check code is received.
(6607
or
6608)
Serial communication error
Abnormal if serial communication between
outdoor controller circuit board and outdoor
power circuit board is defective.
Ed
(0403)
Abnormal if communication between outdoor
controller circuit board and M-NET board is
not available.
OCH771C
Cause
Indoor/outdoor unit connecting
wire has contact failure.
Defective communication circuit of
outdoor controller circuit board
Noise has entered power supply.
Noise has entered Indoor/outdoor
unit connecting wire.
Unauthorized connection of indoor
unit and outdoor unit Connections
other than below combination are
not authorized;
Outdoor unit: Models with R32 refrigerant
Indoor unit: Floor standing type
indoor unit (PSA-KA)
Noise has entered transmission
wire of remote controller.
Noise has entered Indoor/outdoor
unit connecting wire.
Outdoor unit is not a series of
power-inverter.
Breaking of wire or contact failure
of connector CN2 between the
outdoor controller circuit board
and the outdoor power circuit
board
Breaking of wire or contact failure
of connector CN4 between the
outdoor controller circuit board
and the outdoor power circuit
board
Defective communication circuit
of outdoor power circuit board
Defective communication circuit of
outdoor controller circuit board for
outdoor power circuit board
Breaking of wire or contact fail-
ure of connector between out-
door controller circuit board and
M-NET board
Contact failure of M-NET board
power supply line
Noise has entered into M-NET
transmission wire.
48
Judgment and action
Check disconnection or looseness of
indoor/outdoor unit connecting wire.
– Turn the power off, and on again to
check. Replace outdoor controller cir-
cuit board if abnormality is displayed
again.
Alter the connection referring to the combina-
tion as shown in the "cause" column.
Turn the power off, and on again to
check.
Replace indoor controller board or
outdoor controller circuit board if
abnormality is displayed again.
Replace outdoor unit with power-inverter
type outdoor unit.
Check connection of each connector
CN2 and CN4 between the outdoor
controller circuit board and the outdoor
power circuit board.
Replace outdoor power circuit board.
Replace outdoor controller circuit board.
Check disconnection, looseness, or breaking
of connection wire between outdoor control-
ler circuit board (CNMNT) and M-NET board
(CN5).
Check disconnection, looseness, or breaking
of connection wire between outdoor control-
ler circuit board (CNMNT) and M-NET board
(CND).
Check M-NET transmission wiring method.