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3131
C Check of indoor electronic control P.C. board and indoor fan motor
Turn OFF the power supply.
Remove indoor fan motor connector CN211,
vane motor connector CN151 and the i-see
Sensor motor connector CN110 from the
indoor electronic control P.C. board and turn
ON the power supply.
Does the unit operate with the remote
controller?
Does POWER lamp light up by pressing
EMERGENCY OPERATION switch?
Yes
No
Measure the resistance of the i-see
Sensor motor coil.
(Refer to 9-5.)
Measure the resistance between
CN211 and of the indoor fan motor
connector.
Short/open circuit:
Replace the i-see Sensor motor and the
indoor electronic control P.C. board.
Short/open circuit:
Replace the indoor fan motor.
Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor electronic control
P.C. board visually.
Replace the varistor (NR11)
and fuse (F11).
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
(+) and (-) of the indoor fan motor
connector. 1, 2
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 can-
not be measured properly.
Yes
Is the resistance 1 MΩ
or more?
Replace the fuse (F11) and the
indoor fan motor.
No
Replace the fuse (F11).
Measure the resistance of cement
resistor (R111) on the indoor elec-
tronic control P.C. board.
Yes
Is the resistance approx.
4 Ω?
No
Replace the indoor electronic control P.C.
board and the indoor fan motor.
Replace the indoor electronic control P.C. board.
Measure the resistance of the horizon-
tal vane motor coil and the vertical vane
motor coil.
(Refer to 9-5.)
Short/open circuit:
Replace the horizontal vane motor, the
vertical vane motor and the indoor electronic
control P.C. board.