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