28
C Check of indoor P.C. board and indoor fan motor
Turn OFF the power supply.
Remove indoor fan motor connector CN211
from indoor power P.C. board 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 OPERATION INDICATOR lamp light
up by pressing the emergency operation
switch?
Yes
No
Measure the resistance of indoor fan
motor.
Refer to 9-5.
Short circuit:
Replace the indoor fan motor.
Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor power P.C. board
visually.
Replace the varistor (NR11)
and fuse (F11). 3
Are the varistor (NR11)
burnt and the fuse (F11)
blown?
No
No
Yes
Yes
Be sure to check both the fuse
and the varistor in any case.
Is the fuse (F11) blown
only?
Measure the resistance between
CN211 (+) and (-) of indoor fan
motor connector.
*
1,
*
2
Yes
Is the resistance 1MΩ or more?
Replace the fuse (F11) and the
indoor fan motor.
*
3
No
Replace the fuse (F11).
*
3
Measure the resistance of
resistor (R111) on the indoor
power P.C. board.
No
No
Replace the indoor
power P.C. board and
the indoor fan motor.
Replace the indoor electronic control P.C. board.
Measure the resistance of the vane
motor coil.
Refer to 9-5.
Short circuit:
Replace the vane motor and the indoor
electronic control P.C. board.
*
1. The fan motor connector's
lead wire is red,
whereas is black.
*
2. Connect "+" of the tester to fan motor connector's
lead wire, and “-” to
lead wire, otherwise the
resistance cannot be measured properly.
*
3. Please replace the fuse after removing the indoor
power P.C. board from the electrical box.
Is there approximately 5 VDC between
5 V (+) and JPG (GND) (-) of the
indoor electronic control P.C. board?
Is there approximately 12 VDC
between 12 V (+) and JPG (GND) (-)
of the indoor electronic control P.C.
board?
Is connector CN102 on the
indoor electronic control P.C.
board or lead wires discon-
nected?
Yes
Replace the indoor fan motor.
Yes
Connect the connector or repair discon-
nection.
No
Yes
Varistor
(NR11)
Indoor electronic
control P.C. board
GND(JPG)
Fuse (F11)
R111
CN211
Indoor power
P.C. board
CN102
Is the resistance of
resistor (R111) approximately
3.9 Ω ?
Measure the resistance of the i-see
SENSOR MOTOR coil. Refer 9-5.
Short circuit:
Replace the i-see SENSOR MOTOR and
the indoor electronic P.C. board.
OBHT872
