Mitsubishi Electric PUZ-M200YKA Service Manual page 42

Check Code Abnormal points and detection method
Indoor/outdoor unit communication error
(Signal receiving error)
1 Abnormal if indoor controller board could
not receive any signal normally for 6
minutes after turning the power on.
2 Abnormal if indoor controller board could
not receive any signal normally for 3
minutes.
3 Consider the unit as abnormal under
the following condition. When 2 or more
indoor units are connected to an outdoor
unit, indoor controller board could not
receive a signal for 3 minutes from
E6
outdoor controller circuit board, a signal
(6840
which allows outdoor controller circuit
board to transmit signals.
Indoor/outdoor unit communication error
(Transmitting error)
Abnormal if "1" receiving is detected 30
times continuously though indoor controller
E7
board has transmitted "0".
Indoor/outdoor unit communication error
(Signal receiving error)
(Outdoor unit)
E8 Abnormal if outdoor controller circuit board
(6840) could not receive anything normally for 3
minutes.
Indoor/outdoor unit communication error
(Transmitting error) (Outdoor unit)
1 Abnormal if "0" receiving is detected 30
times continuously though outdoor con-
troller circuit board has transmitted "1".
E9
2 Abnormal if outdoor controller circuit board
(6841)
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
check code is received.
EF
(6607
or
6608)
OCH737
Cause
1 Contact failure, short circuit or
miswiring (converse wiring) of
indoor/outdoor unit connecting
wire
2 Defective transmitting receiving
circuit of outdoor controller circuit
board.
3 Defective transmitting receiving
circuit of indoor controller board.
4 Noise has entered into indoor/
outdoor unit connecting wire.
5 Defective fan motor
6 Defective rush current resistor of
outdoor power circuit board
1 Defective transmitting receiving
circuit of indoor controller board
2 Noise has entered into power
supply.
3 Noise has entered into outdoor
control wire.
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.
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)
1 Noise has entered transmission
wire of remote controller.
2 Noise has entered Indoor/outdoor
unit connecting wire.
3 Outdoor unit is not a series of
power-inverter.
42
Judgment and action
Check LED display on outdoor controller
circuit board. (Connect A-Control service
tool (PAC-SK52ST)) Refer to EA−EC item if
LED displays EA−AC.
1 Check disconnecting or looseness of
indoor/outdoor unit connecting wire of
indoor unit or outdoor unit.
Check all the units in the case of twin/
triple/quadruple indoor unit system.
2–4 Turn the power off, and on again to
check.
If abnormality occurs again, replace indoor
controller board or outdoor controller circuit
board.
Note: Other indoor controller board may have
defect in the case of twin/triple/
quadruple indoor unit system.
5 Turn the power off, and detach fan motor
from connector (CNF1, 2). Then turn the
power on again.
If abnormality is not displayed, replace fan
motor.
If abnormality is displayed, replace outdoor
controller circuit board.
6 Check the rush current resistor on outdoor
power circuit board with tester. If open is
detected, replace the power circuit board.
1–3 Turn the power off, and on again to
check. If abnormality occurs again,
replace indoor controller board.
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 cir-
cuit board if abnormality is displayed
again.
Alter the connection referring to the combina-
tion as shown in the "cause" column.
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 power-inverter
type outdoor unit.