38
Check of indoor electronic control P.C. board
C
Check of outdoor unit
D
Compressor and / or outdoor fan does not operate.
Replace the fuse.
Is fuse(F11) blown?
Be sure to check both fuse
and varistor in any case.
Replace the fan motor.
Replace the
indoor electronic
control P.C. board.
Is winding resistance
of fan motor 0
"
?
Is winding resistance
of vane motor 0
"
?
No
Yes
Replace the vane motor.
No
Yes
Yes
Is varistor(NR11) burnt?
Replace the varistor.
Yes
Turn OFF the power supply.
Remove indoor fan motor connector CN211 and
vane motor connector CN151 from the indoor electronic
control P.C. board and turn ON the power supply.
No
No
Yes
No
Is resistance approx. 0
"
?
Replace the fuse (F12).
CN201
1
2
L
1
F12
1
3
Terminal
block
Be sure to check both resistances.
No (
∞
)
Yes
Turn OFF the
power supply.
Turn OFF the
power supply.
Check both “parts side”and “pattern side” of indoor
electronic control P.C. board visually.
Does the unit operate with the remote controller?
Does the OPERATION INDICATOR lamp light up
by pressing the EMERGENCY OPERATION switch?
Measure the
resistance between
CN201
1
on the
indoor electronic
control P.C. board and
L
1
(MS-09/10/12/15/17/18SN)/
c
(MS-24SN) on the
terminal block with
the tester.
C
MS-09/10/12/15/17/18SN
MS-24SN
(
)
The unit doesn’t operate with the remote controller.
Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.
Start
No
Turn ON the power supply.
Press the EMERGENCY OPERATION switch.
3-minute time delay works.
Test run operation operates for 30 minutes.
Yes
Yes
Outdoor unit does not
operate.
Is the connection of wiring
in outdoor unit correct?
Check the outdoor
fan motor and compressor.
Refer to page 36.
Make the connection of
wiring in outdoor unit
correct.
No
Check the voltage to terminal block of
indoor unit. Is there 220V AC to
terminal block between
2
-
C
?
Reconnect the continuity of indoor and
outdoor unit connection.
Yes
Replace the indoor electronic
control P.C. board.
Compressor
does not operate.
No
Yes
Is the connection of wiring
from terminal block to
compressor correct ?
Check the compressor.
Refer to page 36.
Make the connection of
wiring from terminal block
to compressor correct .
Outdoor fan motor
does not operate.
No
Yes
Is the connection of wiring
from terminal block to
outdoor fan motor correct ?
Check the outdoor fan motor.
Refer to page 36.
Make the connection of
wiring from terminal block
to outdoor fan motor
correct .
No
Does outdoor unit operate?
Yes
Ok
No
Does outdoor unit operate?
Ok
Yes
Does outdoor unit operate?
Ok
Yes
No
No
Check the voltage to terminal block of
outdoor unit. Is there 220V AC to
terminal block between
2
-
C
.
<MS-09/10/12/15/17/18SN>
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Summary of Contents for MS-09SN-C1
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