MITSUBISHI ELECTRIC MSH-07NV - Manual (Page 48)

48
10-2 Instruction of troubleshooting
Indoor unit oper-
ates. Outdoor unit
doesn’t operate.
Outdoor unit
operates in
only Test
Run opera-
tion. Outdoor unit
doesn’t oper-
ate even in
Test Run
operation.
Check room
temperature
thermistor.
Refer to
“Check of
outdoor unit”
on page 52.
Indoor unit
dosen’t receive
the signal from
remote
controller.
Refer to
”Check of
receiver P.C.
board” on page
51.
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off. Indoor unit doesn’t
receive the signal from
remote controller.
Also, OPERATION INDI-
CATOR lamp doesn’t
flash, when the EMER-
GENCY OPERATION
switch is pressed.
Refer to “Check of
indoor electronic control
P.C. board” on page 52.
Cause:indoor/outdoor unit
connecting
Trouble of mis-wiring
Trouble of the serial signal
Cause:Indoor unit
2-time-Room tempera-
ture/Indoor coil
thermistor trouble
3-time-Indoor fan motor
trouble
Refer to
“How to check
mis-wiring and sig-
nal error
(when outdoor unit
doesn’t work)”
on page 53 and
54.
❈ 1
6-time flash
2.5-second OFF
Cause:outdoor unit
6-time-Replace the out-
door thermistor
E
D
B
Check room temperature
thermistor. Refer to“Test
point diagram and volt-
age” on page 55,57 and
58.
Refer to
“Check of indoor
fan motor” on
page 51.
Check indoor coil
thermistor. Refer
to“Test point dia-
gram and voltage”
on page 55,57 and
58.
❈ 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.”
2-time flash
2.5-second OFF
3-time flash
2.5-second OFF
Start
1-time flash
C
A
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