17
Check of indoor electronic control P.C. board
C
Indoor electronic
control P.C. board
Varistor (NR11)
Indoor electronic
control P.C. board
Fuse (F11)
Check both “parts side” and “pattern
side” of the indoor electronic control P.C.
board visually.
Replace the fuse.
Is fuse(F11) blown?
Replace the fan
motor.
Is the winding
resistance of
fan motor 0
"
?
Is the winding
resistance of
vane motor 0
"
?
No
Yes
Replace the vane
motor.
No
Yes
Yes
Is varistor(NR11) burnt?
Replace the varistor.
No
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
Does the unit operate with the remote controller?
Does the OPERATION INDICATOR lamp light up by
pressing the EMERGENCY OPERATION switch?
Yes
No
Turn OFF the
power supply.
Turn OFF the
power supply.
Replace the indoor
electronic control
P.C. board.
Measure the
resistance
between
CN201
1
on
the indoor
electronic control
P.C. board and
N
on the terminal
block with a tester.
Is resistance
approximately 0
"
?
Replace the fuse (F12).
No
Yes
(
∞
)
CN201
1
2
L
N
F12
Terminal
block
2
MS-A18/24VD -
K1
1
2
3
MS-A18/24VD -
K2
MS-A30VD
The unit does not operate with the remote controller.
Also, the OPERATION INDICATOR lamp does not light up by pressing the EMERGENCY OPERATION switch.
OB400C--1.qxp 11.7.22 10:13 AM Page 17
OB400C
