35
10-2. Instruction of troubleshooting
1. Troubleshooting check table
•The following indication applies regardless of shape of the indicator.
Operation Indicator
flashing
NOTE : 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.
When rotational frequency
feedback pulse signal is not
emit during 12-second indoor
fan operation.
Check point
●
Check resistance of thermistor.
●
Re-connect connector.
●
Check indoor electronic control P.C.board.
●
Disconnect connector CN211 and then
check connector CN121 - to make
sure rotational frequency feedback signal
of 1.5V or over exists.
●
Check indoor electronic control P.C.
board.
●
Check indoor fan motor.
●
Re-connect connector.
2
3
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 40 or 41.
Refer to
D
"Check of
outdoor unit"
on page 38
or 39.
Refer to
B
"Check of
remote controller
and power
monitor, receiver
P.C. board"
on page 37.
1. Check indoor /
outdoor
connecting wire.
2. Refer to
C
"Check of indoor
electronic control
P.C. board"
on page 38.
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 40 or 41.
Refer to
A
"Check of
indoor fan
motor"
on page 37.
· 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.
OB256-2qxp 2.2.8 9:10 AM Page 35
Summary of Contents for MS-09SN-C1
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