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TROUBLESHOOTING
(BEFORE CALLING FOR SERVICE)
If your air conditioner does not work properly, first check the following
points before requesting service. If it still does not work properly,
contact your dealer or service center.
Trouble
Possible Cause
Air conditioner does
1. Power failure.
not run at all.
2. Leakage circuit
breaker tripped.
3. Line voltage is too
low.
4. Batteries in remote
controller have run
down.
OPERATION lamp
Trouble in system.
blinks and air
conditioner does not
operate.
Compressor runs but
Obstruction in front of
soon stops.
condenser coil.
(Outdoor Unit)
Poor cooling
1. Dirty or clogged air
performance.
filter.
2. Heat source or
many people in
room.
3. Doors and/or
windows are open.
4. Obstacle near air
intake or air
discharge port.
5. Thermostat is set
too high for cooling.
Clicking sound is
In cooling operation,
heard from the air
any plastic parts may
conditioner.
shrink due to a
sudden temperature
change. In this event,
a clicking sound may
occur.
OPERATION lamp
The use of cellular
lights but outdoor unit
phones near the air
will not run.
conditioner may cause
disturbance to its
normal operation.
TIMER lamp blinks
FLOAT SWITCH is
(3 sec. interval) and
actived.
air conditioner does
not operate.
The air conditioner is operable within the temperature ranges as
listed below:
For Cooling Only Models : CU-KS18NKU
Remedy
COOLING
1. Restore power.
2. Contact service
center.
For Low Ambient Cooling Models : CU-KS12NK1A, CU-KS18NKUA
3. Consult your
electrician or
dealer.
4. Replace batteries.
COOLING
Contact service
center.
For Cooling Only Models : CU-3KS19NBU, CU-4KS24NBU,
Remove obstruction.
1. Clean air filter to
COOLING
improve airflow.
2. Eliminate heat
source if possible.
3. Shut them to keep
the heat out.
4. Remove it to ensure
A separately sold wired remote controller (CZ-RD515U)
good airflow.
used with this air conditioner is also available. If you wish
to use the wired remote control function, you will need to
5. Set the temperature
purchase the optional wired remote controller.
lower.
This is normal, and
the sound will soon
disappear.
1. Turn off the power
then restart the air
conditioner after a
while.
2. Consult your dealer.
Contact service
center.
OPERATING RANGE
Temperature
Indoor air
temperature
Max.
95 °F DB /
71 °F WB
Min.
67 °F DB /
57 °F WB
Temperature
Indoor air
temperature
Max.
95 °F DB /
71 °F WB
Min.
67 °F DB /
57 °F WB
CU-4KS31NBU
Temperature
Indoor air
temperature
Max.
95 °F DB /
71 °F WB
Min.
67 °F DB /
57 °F WB
WIRED REMOTE CONTROLLER
Outdoor air
temperature
115 °F DB
67 °F DB
Outdoor air
temperature
115 °F DB
0 °F DB
Outdoor air
temperature
115 °F DB
14 °F DB
15
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