16

C Check of indoor electronic control P.C. board

The unit doesn’t operate with the remote controller.

Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.

CN201
L
N
13
Terminal
block
Check both “parts side” and “pattern
side” of the 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 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.
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
1.Pull out the power
supply cord.
2.Measure the
resistance between
CN201 1 on
the indoor electronic
control P.C. board
and on the
terminal block with
a tester.
Is there resistance
approx. 0 "?
Replace the fuse (F12).
CN201 1
2
L
N
F12
13
Terminal
block
Be sure to check both resistance.
Turn OFF the
power supply.
Turn OFF the
power supply.
Yes
No(∞)
MS-GD10ND MS-GD08/GD12ND