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13-2. Instruction of troubleshooting
MSC-A07WV -
E1
MSC-A09WV -
E1
MSC-A12WV -
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/A12WV
temperature
MUX-A19/A20/
thermistor.
A25/A26WV
Refer to
Refer to D
"Test point
"Check of
diagram and
outdoor unit"
voltage" on
on page 113
page 124.
or 114.
MUH-A07/A09/A12WV
MUH-A07/A09/A12WV
Flash on and
1-time flash
off at 0.5-
Cause:
second
Outdoor /
intervals
Cause:
Indoor unit
Indoor/
• Trouble of
Outdoor unit
serial signal
• Mis-wiring
Refer to G "How to check
mis-wiring and serial signal
error (When outdoor unit
doesn't work)" on page 117.
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".
MU-A07WV -
MUH-A07WV -
E1
MU-A09WV -
MUH-A09WV -
E1
MU-A12WV -
MUH-A12WV -
E1
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/A12WV
MU/H-A07/A09/A12WV
Refer to F
Refer to E
"Check of
"Check of
R.V. coil"
outdoor unit"
on page 116.
on page 115.
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 112.
tor.
Refer to
"Test point
diagram and
voltage"
on page 124.
MUX-A10WV -
E1
MUX-A19WV -
E1
MUX-A20WV -
E1
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.
1. Check indoor /
Refer to B
"Check of
remote
2. Refer to C
controller
"Check of indoor
and receiver
electronic control
P.C. board"
P.C. board"
on page 112.
on page 113.
7-time flash
6-time flash
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Trouble of
outdoor
thermistor
control
in outdoor
system
unit
MUH-A07/A09/A12WV
MUH-A07/A09/A12WV
Refer to H
Replace the
"Check of
deicer
outdoor
P.C. board.
thermistor"
on page 118.
105
MUX-A25WV -
E1
MUX-A26WV -
E1
E1
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/
outdoor
Refer to I
connecting wire.
"Check of
indoor/outdoor
units' connection
and outdoor unit"
on page 118.
E1
E1
A25/A26WV
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Table of Contents
Troubleshooting
