Mitsubishi Electric MSC-A07YV-E1 Service Manual page 20

10-2. Instruction of troubleshooting
MSC-A07YV -
E1
MSC-A09YV -
E1
MSC-A12YV -
E1
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Outdoor unit Outdoor unit
operates in doesn't
only Test Run operate
operation. even in
Test Run
operation.
Check room
MUH-A07/A09/A12YV
temperature
MUX-A19/A20/A22/
thermistor.
A25/A26WV
Refer to
Refer to
"Test point
"Check of
diagram and
outdoor unit".
voltage" on
page 25.
MUH-A07/A09/A12YV
MUH-A07/A09/A12YV
MXZ-A18/A26/A32WV
MXZ-A18/A26/A32WV
Flash on and
1-time flash
off at 0.5-
Cause:
second
intervals
Outdoor /
Cause:
Indoor unit
Indoor/
• Trouble of
Outdoor unit
serial signal
• Mis-wiring
Refer to D "How to check
mis-wiring and serial signal
error (When outdoor unit
doesn't work)" on page 24.
W1
W1.<The case of the trouble of the serial signal>
When the power is turned off and then turned on again, the indication shows "the trouble of mis-wiring".
As for outdoor unit MU type, refer to service manual OB330.
As for outdoor unit MUH type, refer to service manual OB331.
As for outdoor unit MUX type, refer to service manual OB307 REVISED EDITION-A or OB318.
As for outdoor unit MXZ type, refer to service manual OB319.
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
Outdoor unit Unit doesn't
doesn't operate
stop even normal
if indoor unit operation in
stops. COOL or
HEAT mode.
MUH-A07/A09/A12YV
MU-A07/A09/A12YV
MXZ-A18/A26/A32WV
Check of wiring
Refer to
diagram of
"Check of
outdoor unit".
R.V. coil" and
MUH-A07/A09/A12YV
others.
Refer to
"Check of
outdoor unit".
2-time flash
3-time flash
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble of
• Trouble of
room temp-
indoor fan
erature/
motor
indoor coil
thermistor
Check room Refer to A
temperature
"Check of
thermistor
indoor fan
and indoor
motor"
coil thermis-
on page 22.
tor.
Refer to
"Test point
diagram and
voltage"
on page 25.
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
Indoor unit
doesn't operate,
operates,
when the
when the
EMERGENCY
EMERGENCY
OPERATION
OPERATION
switch is
switch is
pressed.
pressed.
Refer to B 1. Check indoor /
outdoor
"Check of
connecting wire.
remote
2. Refer to C
controller
"Check of indoor
and receiver
electronic control
P.C. board"
P.C. board"
on page 23.
on page 23.
MXZ type
6-time flash
5-time flash
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Outdoor
thermistor
power
in outdoor
system
unit
abnormality
Refer to
MUH-A07/A09/A12YV
MXZ-A18/A26/A32WV
"Check of
Refer to
inverter/
"Check of
compressor"
outdoor
and "Check
thermistor"
of power
and others.
supply".
20
OPERATION Indoor unit
INDICATOR
operates.
lamp on the
But indoor
indoor unit is
unit doesn't
flashing on
blow out
and off.
cool air.
MUX-A10/A19/A20/
A22/A25/A26WV
Refer to
"Check of
indoor/outdoor
units' connection
and outdoor
unit".
10-time flash
7-time flash
Cause:
Cause:
Outdoor unit
Outdoor unit
MXZ type
• Trouble of
• Outdoor
outdoor
refrigerant
control
system
system
abnormality
MXZ type
MUH-A07/A09/A12YV
MXZ-A18/A26/A32WV
Refer to
Replace the
outdoor
deicer
refrigerant
P.C. board
system
and others.
related items.