The following symptoms are NOT system malfunctions:
14.2.1 Symptom: The system does not operate
▪ The air conditioner does not start immediately after the ON/OFF button on the user interface is pressed. If the operation lamp lights, the system is in normal condition. To prevent overloading of the compressor motor, the air conditioner starts 5 minutes after it is turned ON again in case it was turned OFF just before. The same starting delay occurs after the operation mode selector button was used.
▪ If "Under Centralized Control" is displayed on the user interface, pressing the operation button causes the display to blink for a few seconds. The blinking display indicates that the user interface cannot be used.
▪ The system does not start immediately after the power supply is turned on. Wait one minute until the micro computer is prepared for operation.
14.2.2 Symptom: Cool/Heat cannot be changed over
▪ When the display shows (change-over under centralized control), it shows that this is a slave user interface.
▪ When the cool/heat changeover remote control switch is installed and the display shows (change-over under centralized control), this is because cool/heat changeover is controlled by the cool/ heat changeover remote control switch. Ask your dealer where the remote control switch is installed.
14.2.3 Symptom: Fan operation is possible, but cooling and heating do not work
Immediately after the power is turned on. The micro computer is getting ready to operate and is performing a communication check with all indoor units. Please wait 12 minutes (max.) till this process is finished.
14.2.4 Symptom: The fan strength does not correspond to the setting
The fan speed does not change even if the fan speed adjustment button in pressed. During heating operation, when the room temperature reaches the set temperature, the compressor unit goes off and the indoor unit changes to whisper fan speed. This is to prevent cold air blowing directly on occupants of the room. The fan speed will not change even when another indoor unit is in heating operation, if the button is pressed.
14.2.5 Symptom: The fan direction does not correspond to the setting
The fan direction does not correspond with the user interface display. The fan direction does not swing. This is because the unit is being controlled by the micro computer.
14.2.6 Symptom: White mist comes out of a unit (Indoor unit)
▪ When humidity is high during cooling operation. If the interior of an indoor unit is extremely contaminated, the temperature distribution inside a room becomes uneven. It is necessary to clean the interior of the indoor unit. Ask your dealer for details on cleaning the unit. This operation requires a qualified service person.
▪ Immediately after the cooling operation stops and if the room temperature and humidity are low. This is because warm refrigerant gas flows back into the indoor unit and generates steam.
14.2.7 Symptom: White mist comes out of a unit (Indoor unit, heat exchanger unit)
When the system is changed over to heating operation after defrost operation. Moisture generated by defrost becomes steam and is exhausted.
14.2.8 Symptom: The user interface display reads "U4" or "U5" and stops, but then restarts after a few minutes
This is because the user interface is intercepting noise from electric appliances other than the air conditioner. The noise prevents communication between the units, causing them to stop. Operation automatically restarts when the noise ceases.
14.2.9 Symptom: Noise of air conditioners (Indoor unit, heat exchanger unit)
▪ A "zeen" sound is heard immediately after the power supply is turned on. The electronic expansion valve inside an indoor unit starts working and makes the noise. Its volume will reduce in about one minute.
▪ A continuous low "shah" sound is heard when the system is in cooling operation or at a stop. When the drain pump (optional accessories) is in operation, this noise is heard.
▪ A "pishi-pishi" squeaking sound is heard when the system stops after heating operation. Expansion and contraction of plastic parts caused by temperature change make this noise.
▪ A low "sah", "choro-choro" sound is heard while the indoor unit is stopped. When another indoor unit is in operation, this noise is heard. In order to prevent oil and refrigerant from remaining in the system, a small amount of refrigerant is kept flowing.
14.2.10 Symptom: Noise of air conditioners (Indoor unit, compressor unit, heat exchanger unit)
▪ A continuous low hissing sound is heard when the system is in cooling or defrost operation. This is the sound of refrigerant gas flowing through the compressor unit, heat exchanger unit and indoor units.
▪ A hissing sound which is heard at the start or immediately after stopping operation or defrost operation. This is the noise of refrigerant caused by flow stop or flow change.
14.2.11 Symptom: Noise of air conditioners (compressor unit, heat exchanger unit)
When the tone of operating noise changes. This noise is caused by the change of frequency from the compressor or the fans.
14.2.12 Symptom: Dust comes out of the heat exchanger unit
When the unit is used for the first time in a long time. This is because dust has gotten into the heat exchanger unit.
14.2.13 Symptom: The units can give off odours
The unit can absorb the smell of rooms, furniture, cigarettes, etc., and then emit it again.
14.2.14 Symptom: The heat exchanger unit fan does not spin
During operation. The speed of the fan is controlled in order to optimise product operation.
14.2.15 Symptom: The display shows "88"
This is the case immediately after the main power supply switch is turned on and means that the user interface is in normal condition.
This continues for one minute.
14.2.16 Symptom: The compressor in the compressor unit does not stop after a short heating operation
This is to prevent refrigerant from remaining in the compressor. The unit will stop after 5 to 10 minutes.
14.2.17 Symptom: The inside of an compressor unit is warm even when the unit has stopped
This is because the crankcase heater is warming the compressor so that the compressor can start smoothly.
14.2.18 Symptom: Hot air can be felt when the indoor unit is stopped
Several different indoor units are being run on the same system.
When another unit is running, some refrigerant will still flow through the unit.
Contact your dealer for removing and reinstalling the total unit.
Moving units requires technical expertise.
This unit uses hydrofluorocarbon. Contact your dealer when discarding this unit. It is required by law to collect, transport and discard the refrigerant in accordance with the "hydrofluorocarbon collection and destruction" regulations.