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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 press-
ing the EMERGENCY OPERATION switch.
Check the both "parts side" and "pattern
side" of indoor electronic control P.C.
board visually.
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.
Does the unit operate with the remote controller?
Does the OPERATION INDICATOR lamp light up by
pressing the EMERGENCY OPERATION switch?
Yes
Replace the vane
Turn OFF the
motor.
power supply.
Is winding
resistance of
vane motor 0 "?
Be sure to check both resistance.
Is winding
resistance of
fan motor 0 "?
Replace the fan
motor.
Check of outdoor unit
D
Compressor and / or outdoor fan motor doesn't operate.(Only indoor fan operates.)
MSH-C18TV
Start
Press the EMERGENCY OPERATION switch.
3-minute time delay works.
Test run operation operates for 30 minutes.
Check the voltage to the terminal block of outdoor
unit. Is there 230V AC to the terminal block between
-
?
2
N
No
Check the voltage to the terminal block of indoor unit.
Is there 230V AC to the terminal block between
-
?
2
N
No
Replace the indoor elec-
tronic control P.C. board.
No
Turn OFF the
power supply.
Yes
No
Be sure to check both fuse
and varistor in any case.
Is varistor(NR11) burnt?
No
Yes
Yes
Yes
Replace the fuse.
Yes
No
Is fuse(F11) blown?
No
Yes
Replace the varistor.
Check the outdoor deicer P.C. board at first, then check
the outdoor fan motor and the compressor.
Check the continuity of indoor and outdoor unit connection.
40
1
1
2
3
CN201
Replace the indoor
electronic control
P.C. board.
Measure the
resistance between
1
CN201
on the
Is resistance approx. 0"?
indoor electronic
control P.C. board
N
and
on the terminal
block with the tester.
Replace the fuse (F12).
F12
N
Terminal
block
Yes
No(∞)
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