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When rotational frequency
feedback signal is not emit
during 12-second indoor fan
operation
30
11-2. Instruction of troubleshooting
1. troubleshooting check table
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
Self check table
NO.
1
2
Abnormal
point
Indoor coil
thermistor
Room
tempera-
ture ther-
mistor
Indoor fan
motor
Indication
2-time flash
2.5-second OFF
3-time flash
2.5-second OFF
Symptom
Outdoor unit
does not run.
Indoor fan motor
repeats 12 sec-
onds ON and 3
minutes OFF.
When the indoor
fan motor
breaks, the fan
keeps stopping.
Detect method
Detect Indoor coil/room tem-
perature thermistor short or
open circuit every 8 seconds
during operation.
Check point
●
Check thermistor calibration.
●
Reconnect connector.
●
Check indoor electronic control P.C.
board.
●
Disconnect connector CN211 and then
check connector CN121
2
-
3
to make
sure rotational frequency feedback signal
of 1.5V or over exists.
●
Check indoor electronic control P.C.
board.
●
Check indoor fan motor.
●
Reconnect connector.
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Indoor unit
doesn't receive
the signal from
remote controller.
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
Outdoor unit
operates in
only Test Run
operation.
Outdoor unit
doesn't
operate
even in
Test Run
operation.
Indoor unit
operates,
when the
EMERGENCY
OPERATION
switch is
pressed.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.
Check room
temperature
thermistor.
Refer to
"Test point
diagram and
voltage" on
page 36.
Refer to
D
"Check of
outdoor unit"
on page 33
or 34.
Refer to
B
"Check of
remote
controller
and receiver
P.C. board"
on page 32.
1. Check indoor /
outdoor
connecting wire.
2. Refer to
C
"Check of indoor
electronic control
P.C. board"
on page 33.
2-time flash
Cause:
Indoor unit
• Trouble of
room temp-
erature/
indoor coil
thermistor
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Check room
temperature
thermistor and
indoor coil
thermistor.
Refer to "Test
point diagram
and voltage" on
page 36.
Refer to
A
"Check of
indoor fan
motor"
on page 32.
Outdoor unit
doesn't
stop even if
indoor unit
stop.
Refer to
E
"Check of
outdoor unit"
on page 35.
MS-C24TV only
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
Operation Indicator
· Flashing of the OPERATION INDICATOR lamp (on the left-hand side)
indicates possible abnormalities.
· The OPERATION INDICATOR lamp (on the left-hand side) is lighting during
normal operation.
flashing
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