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CN211
Fuse(F11)
Varistor(NR11)
Indoor electronic
control P.C.Board
C Check of indoor electronic control P.C. board and indoor fan motor
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.
Does the unit operate with the remote
controller? Does OPERATION INDICATOR
lamp light up by pressing EMERGENCY
OPERATION switch?
Yes
No
Measure the resistance between
CN211 and of the indoor fan motor
connector.
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 indoor
electronic control P.C. board.
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 (to CN211 on the indoor
electronic control P.C. board).
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 indoor electronic control P.C. board
and the indoor fan motor.
No
Replace indoor electronic control
P.C. board.
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.
(Refer to 8-5.)
Short/open circuit:
Replace the horizontal vane motor and the
indoor electronic control P.C. board.