1
1-11-1-2-29
Troubleshooting
Indoor unit
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 a service center.
Symptom
Cause
Noise
Sound like streaming water during
operation or after operation
Sound of refrigerant liquid flowing inside unit
Sound of drainage water through drain pipe
Odor
Cracking noise during operation or
when operation stops.
Cracking sound due to temperature changes of parts
Discharged air is smelled during
operation.
Dewdrop
Indoor odor components, cigarette odor and cosmetic odor accumulated
in the air conditioner and its air is discharged.
Unit inside is dusty. Consult your dealer.
Dewdrop gets accumulated near air
discharge during operation
Fog
Indoor moisture is cooled by cool wind and accumulated by dewdrop.
Cleaning is necessary because unit inside (heat exchanger) is dirty.
Consult your dealer as technical engineering is required.
During defrost operation
Fog occurs during operation in
cooling mode.
(Places where large amounts of oil
mist exist at restaurants.)
Fan is rotating for a while even though operation
stops.
Dust
Dust accumulation inside indoor unit is discharged.
Fan rotating makes operation smoothly.
Fan may sometimes rotate because of drying heat exchanger due to settings.
Fan may sometimes rotate in internal cleaning operation mode for a while.
Poor cooling or heating performance
The indoor unit is initially designed to control the indoor temperature
detected by the built-in room sensor inside the indoor unit.
Due to indoor unit installation position, however, the built-in sensor may
occasionally sense temperature improperly; for example, temperature
difference between the ceiling and floor, lighting apparatus, electric fan,
windows or waist-high partition walls, etc.
In this case, the unit does not operate properly at the desired temperature.
You may change the use of the temperature sensor inside the indoor unit
to that of the remote controller.
Then the desired room temperature can be controlled properly.
For details, consult your dealer.
Check Before Requiring Services
Symptom
Cause
Remedy
Air conditioner does not run
at all although power is turned
on.
Power failure or after power failure
Press ON/OFF operation button on remote
controller again.
Operation button is turned off.
Switch on power if breaker is turned off.
If breaker has been tripped, consult your dealer
without turning it on.
Fuse blow out.
If blown out, consult your dealer.
Poor cooling or heating
performance
Air intake or air discharge port of indoor
and outdoor units is clogged with dust or
obstacles.
Remove dust or obstruction.
Fan speed switch is set to “Low”.*
Improper temperature settings
Change to “Medium” or “High”.*
Air filter is clogged.
Doors and /or windows are open.
See “
(on page 1-11-1-2-30)
Tips for Energy Saving”.
Room is exposed to direct sunlight in cooling mode.
See “ Care and Cleaning”. (on page 1-11-1-2-28)
Too much heat sources in room in cooling mode. Use minimum heat sources and in a short time.
Too many people in room in cooling mode. Reduce temperature settings or change to “Medium” or “High”.*
*Fan speed display on the remote controller
(CZ-RTC4),
(CZ-RTC4),
High :
Medium :
Low :
(CZ-RTC4),
(CZ-RTC5B, CZ-RTC6*)
(CZ-RTC5B, CZ-RTC6*)
(CZ-RTC5B, CZ-RTC6*)
If your air conditioner still does not work properly although you checked the points as described above, first stop the operation
and turn off the power switch. Then contact your dealer and report the serial number and symptom. Never repair your air
conditioner by yourself since it is very dangerous for you to do so.
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