28
Check of indoor electronic control P.C. board
C
The unit doesn’t operate with
the remote controller.
Also, the operation indicator
doesn’t light up by pressing the
emergency ON/OFF switch.
Replace 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 there 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?
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.
Replace indoor electronic
control P.C. board.
Check outdoor unit fan motor
and compressor.
Check continuity of indoor
and outdoor unit connection.
No
Yes
Yes
No
Check voltage to terminal
block of outdoor unit. Is there
AC220V to terminal block
between - ?
2
N
Check voltage to terminal
block of indoor unit. Is there
AC220V to terminal block
between - ?
2
N
<MS-18NN>
Start
Press EMERGENCY ON/OFF
button. 3-minute time delay
works. Test mode operates
for 30 minutes.
Check the outdoor wiring and
conductor relay.
Yes
Yes
Yes
Check voltage to terminal
block of outdoor unit. Is there
AC220V to terminal block
between - ?
2
N
Check voltage to terminal
block of outdoor unit. Is there
AC220V to terminal block
between - ?
3
N
Check voltage to terminal
block of indoor unit. Is there
AC220V to terminal block
between - ?
3
N
<MS-24NN>
Check the outdoor wiring.
Check the indoor/outdoor
wirining.
No
No
No
Replace the
indoor
electronic
P.C.board
CN201
①
➂
L
N Terminal
block
OB188--2.qxp 25/9/97 6:09 PM Page 8
Summary of Contents for MS-18NN Series
Page 4: ...4 REMOTE CONTROLLER MS 18NN MS 24NN S1 S1 ...
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