Instruction Of Troubleshooting - Mitsubishi Electric Mr. Slim MSH09NW Service Manual

11-2 Instruction of troubleshooting

Indoor unit oper-
ates. Outdoor unit
doesn't operate.
Outdoor unit
Outdoor unit
operates in
doesn't oper-
only Test
ate even in
Run opera- Test Run
tion.
operation.
Refer to
Check room
"Check of
temperature
outdoor unit"
thermistor.
on page 49.
MSH12NN
MSH15NN
MSH17NN
When the
remote controller
is pressed or
when the
Emergency
operation switch
is pressed,the
fan does not
rotate,with
Operation indi-
cator lamp on.
44
Indoor unit
dosen't receive
the signal from
remote
controller.
Refer to
B
"Check of
receiver P.C.
board" on
page 48.
1-time flash
D
Cause:indoor/outdoor unit
connecting
(
Trouble of mis-wiring
Trouble of the serial signal
Refer to
E
"How to check
mis-wiring and sig-
nal error
(when outdoor unit
doesn't work)"
on page 50. 1
Start
Indoor unit operation
monitor lamp is flashing.
2-time flash
2.5-second OFF
MSH09NW only
3-time flash
2.5-second OFF
Cause:Indoor unit
2-time-Room tempera-
ture/Indoor coil
thermistor trouble.
MSH09NW only
3-time-Indoor fan motor
trouble
Check indoor coil
thermistor. Refer
to"Test point dia-
Refer to
A
gram and voltage"
"Check of indoor
on page 51 and
fan motor" on
52.
page 47.
1<The case of the trouble of the serial signal>
when turn off the power and then turn on the power again, the
indication shows "the trouble of mis-wiring."
Indoor unit doesn't
receive the signal from
remote controller.
Also, operation monitor
lamp doesn't flash, when
the emergency operation
switch is pressed.
Refer to "Check of
C
indoor electric control
P.C. board" on page 49.
6-time flash
2.5-second OFF
Cause:outdoor unit
6-time-Replace the out-
door thermistor
Check room temperature
thermistor. Refer to"Test
point diagram and volt-
age" on page 51 and 52.