20
Check of remote controller and indoor electronic control P.C. board
B
Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller.
w
Check if the remote controller is exclusive for this air conditioner.
Yes
Replace the batteries. (Refer to 10-1.4.)
Is noise heard from radio?
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?
Replace the indoor electronic
control P.C. board.
(including the receiver)
Replace the remote controller.
●
Reinstall the unit away from lights.
●
Attach a filter on receiving part.
Press OPERATE/STOP(ON/OFF) button on the remote controller.
Is LCD display on the the remote
controller visible?
Remove the batteries, then set them back
and press RESET button. (Refer to 10-
1.4.) Check if the unit operates with the
remote controller.
Yes
Does the unit operate with the
remote controller?
Yes
OK
No
(not clear)
Yes
No
No
No
Check of indoor fan motor
A
When OPERATION INDICATOR lamp flashes 3-time. Indoor fan does not operate.
10-6. Troubleshooting flow
CN211
Indoor power P.C.board
Fuse (F11)
Indoor terminal
P.C.board
Varistor
(NR11)
CN121
Is the resistance 0 (short circuit) or
∞
(open circuit)?
Yes ( 0 or
∞
)
No
Yes
No
Turn OFF the power supply.
Check connector CN211 visually.
Disconnect the lead wires from connector CN211 on indoor power P.C. board.
Measure the resistance between lead wires No.1 and No.4 and then No.4 and No.7.
Turn ON the power supply. Rotate indoor fan slowly for 1 revo-
lution or over with a screwdriver etc. from air outlet, and mea-
sure the voltage No.2(+) and No.1(-) on CN121.
No
(others)
Replace the indoor power / terminal P.C. board
and the indoor electronic control P.C. board.
Does the voltage repeat 0V DC and 5V DC?
Yes
No
Are lead wires connected?
Reconnect the lead wires.
Resolder it.
Replace the indoor fan motor.
Are soldered points of the
connector correctly soldered to
indoor power P.C. board?
Yes
Turn ON a radio to AM and press
OPERATE/STOP(ON/OFF) button on the remote controller.
