49
Check of indoor electronic control P.C. board
C
The unit doesn’t operate with the
remote controller.
Also, the OPERATION INDICATOR
lamp doesn’t light up by pressing the
EMERGENCY OPERATION switch.
Replace the fuse.
1.Pull out power supply
cord.
2.Measure resistance
between CN201
on electronic con-
trol P.C. board and
on the terminal block
with a tester.
Trouble of indoor electronic con-
trol P.C. board.
Is ther resistance?
(Approx.0
Ω
)
Trouble of fuse(F12)
Replace varistor.
1
N
Yes
No
Yes
No
Check both “parts side”and “pattern
side of indoor electronic control P.C.
board visually.
No
Is varistor(NR11)burnt?
Yes
Is fuse(F11)blown?
L
1
N Terminal
block
CN201
1
1
4
4
09NW
12/15/17NN
1
1
CN201
Be sure to check both fuse
and varistor in any case.
4
4
L
N Terminal
block
Check of outdoor unit
D
Compressor and outdoor fan do not operate.(Only indoor fan operates.)
Start
Press EMERGENCY ON/OFF button.
3-minute time delay works.
Test mode operates for 30 minutes.
Check voltage to terminal block of outdoor unit. Is
there AC115V(MSH09),208/230V(MSH12/15/17) to
terminal block between - (MSH09), -
(MSH12/15/17)?
Replace indoor electronic control P.C. board.
Check the outdoor DEICER P.C. board at first, then check
the outdoor fan motor and the compressor.
Check continuity of indoor and outdoor unit connection.
No
No
Yes
Yes
L
1
N Terminal
block
N
L
1
L
2
L
1
Check voltage to terminal block of indoor unit. Is
there DC12V to terminal block between - ?
3
1
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