44
Check of indoor fan motor
A
Check of remote controller and receiver P.C. board
B
Repair or replace the indoor fan motor.
Are lead wires connected?
Re-connect the lead wires.
Is soldered point of the connector
correctly soldered?
Re-solder it.
Is resistance 0 (short circuit) or
∞
(open circuit)?
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller.
Yes ( 0 or
∞
)
Yes
No
Yes
No
Turn OFF the power supply.
Check connector CN211 visually.
Disconnect lead wires from connector CN211 on indoor electronic control P.C. board.
Measure resistance between lead wires No.1 and No.5 and then No.3 and No.5.
Yes
Replace the batteries.(Refer to page 40.)
Turn on a radio to AM and press switch on
the remote controller.
Is noise heard from radio?
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?
Replace the remote controller.
• Re-install the unit away from lights.
• Attach a filter on receiving part.
Switch on the remote controller.
Is LCD display on the remote con-
troller displayed?
Remove batteries, then set them back and
press the RESET button. 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
Yes
Measure the voltage between receiver P.C. board connector CN302 No.3
(–)
and No.5
(+)
when the remote controller
button is pressed.
Is the voltage approx. 4V DC?
Replace the indoor electronic control
P.C. board.
Replace the receiver P.C. board.
No(5V or 0V DC)
No
w
Check the remote controller is exclusive for this air conditioner.
When OPERATION INDICATOR lamp flashes 3-time.
Indoor fan motor doesn’t operate.
Turn ON the power supply. Stop it if the unit oper-
ate. Insert screwdriver into air outlet to rotate
indoor fan motor slowly for 1 revolution or over, and
measure voltage No.2(+) and No.3(-) on CN121.
No
(others)
Replace the indoor electronic control P.C. board.
Does voltage repeat 0V DC and 5V DC?
Yes
No
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