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Check of indoor electronic control P.C. board
T
Varistor (NR11)
Indoor electronic
control P.C. board
Fuse (F11)
Check both “parts side”
and “pattern side” of indoor
electronic control P.C.
board visually.
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
Does the unit operate with the remote controller?
Does the OPERATION INDICATOR lamp light up
by pressing the EMERGENCY OPERATION switch?
Yes
No
Be sure to check both resistance.
Turn OFF the
power supply.
Turn OFF the
power supply.
Turn ON power supply.
No
Yes
Yes
No
No
Yes
Start
Check the connecting of main circuit parts.
Is there voltage 230V AC between the
power supply terminal block
L
-
N
?
Is there voltage 325V DC across the
smoothing capacity?
Check the power supply cable.
Check the main circuit parts
and replace them.
Replace the outdoor electronic control
P. C. board.
Replace the noise
filter P. C. board.
Is there voltage 230V AC across the
input terminal part in the diode stack
(DS61)?
Check of outdoor power supply
U
Unit doesn’t operate with the remote controller.
Also, OPERATION INDICATOR lamp doesn’t light up by EMERGENCY OPERATION switch ON.
OB245--3qxp 02.10.22 4:15 PM Page 85