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Following Symptoms are not Air Conditioner Troubles
The system does not operate
•
The air conditioner does not start immediately when restarting or changing the operation mode.
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.
•
If “
CENTRAL
CONTROL
” is displayed on the remote controller and pressing the operation button causes the display to blink for a few
seconds.
This indicates that the central device is controlling the unit.
The blinking display indicates that the remote control cannot be used.
•
The system does not start immediately after the power supply is turned on.
Wait 10 minutes until the micro computer is prepared for operation.
It stops sometimes
•
The remote controller display reads “U4” or “U5” and the unit stops but then restarts after a few minutes.
This is because the remote control is intercepted by noise from electrical appliances other than the air conditioner, and this prevents
communication between the units, causing them to stop.
Operation automatically restarts when the noise goes away.
Cool/heat cannot be changed over
•
When the display shows “
MASTER
CONTROLLED
”.
It shows that this is a slave remote controller.
Refer to “ Setting the Cool/Heat Change over Master ”.
•
When the Cool/Heat selector switch is installed and the display shows “
MASTER
CONTROLLED
”.
This is because COOL/HEAT change over is controlled by the Cool/Heat selector. Ask your local dealer where the Cool/Heat selector is installed.
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. Wait 10 minutes.
The fan speed does not correspond to the setting
•
The fan speed does not change even if the fan speed control button is pressed.
During heating operation, when the room temperature reaches the set temperature, the outdoor unit goes off and the indoor unit changes to
whisper the fan speed.
This is to prevent cold air blowing directly on occupants of the room.
The fan speed will not change even if the button is pressed, when another indoor unit is in heating operation.
The fan direction does not correspond to the setting
•
The fan direction does not correspond to the remote control display.
The fan direction does not swing.
This is because the unit is being controlled by the micro computer.
Following Symptoms are not Air Conditioner Troubles
White mist comes out of the unit
Indoor unit
•
When humidity is high during cooling operation.
If the interior of 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 local 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.
Outdoor unit
•
When the system is changed over to heating operation after defrost operation.
Moisture generated by defrost becomes steam and is exhausted.
Noise of air conditioners
Indoor unit
•
An electric starting 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 1 minute.
•
When the drain pump (an optional accessory) is in operation, this noise is heard.
•
A 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 sound like dripping water is heard while the indoor unit is stopped.
When the other 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.
Outdoor unit
•
When the tone of operating noise changes.
This noise is caused by the change of frequency.
Indoor unit, outdoor 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 both indoor and outdoor 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.
Dust comes out of the unit
•
When the unit is used after stopping for a long time.
This is because dust has gotten into the unit.
The units can give off odors
•
During operation.
The unit can absorb the smell of rooms, furniture, cigarettes, etc., and then emit it again.
The outdoor unit fan does not rotate
•
During operation.
The speed of the fan is controlled in order to optimize product operation.
The compressor or fan in the outdoor unit does not stop
•
This is to prevent oil and refrigerant from remaining in the compressor. The unit will stop after 5 to 10 minutes.
The inside of outdoor 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.
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2019/10/23 9:25:40
