Fujitsu Room Air Conditioner Multi Split Type (3 rooms), ASU18T Troubleshooting, Symptom Problem

Page 23

TROUBLESHOOTING

Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL” (Reverse Cycle).

In the event of a malfunction (burning smell, etc.), immediately stop operation, turn off the cir-

WARNING! cuit breaker, and consult authorized service personnel.

Merely turning off the unit’s power switch will not completely disconnect the unit from the power source. Always be sure to turn off your circuit breaker to ensure that power is completely off.

Before requesting service, perform the following checks:

 

Symptom

Problem

See Page

 

 

 

 

NORMAL

Doesn’t operate immedi-

● If the unit is stopped and then immediately started again, the com-

 

FUNCTION

ately:

pressor will not operate for about 3 minutes, in order to prevent

 

 

 

fuse blowouts.

—

 

 

● Whenever the power switch is turned off then on again, the pro-

 

 

 

 

 

tection circuit will operate for about 3 minutes, preventing unit

 

 

 

operation during that period.

 

 

 

 

 

 

Noise is heard:

● During operation and immediately after stopping the unit, the

 

 

 

sound of water flowing in the air conditioner’s piping may be

 

 

 

heard. Also, noise may be particularly noticeable for about 2 to 3

 

 

 

minutes after starting operation (sound of coolant flowing).

—

 

 

● During operation, a slight squeaking sound may be heard. This is

 

 

 

the result of minute expansion and contraction of the front cover

 

 

 

due to temperature changes.

 

 

 

 

 

 

 

*● During Heating operation, a swoosh sound may be heard occa-

15

 

 

sionally. This sound is produced by the Automatic Defrosting op-

 

 

eration.

 

 

 

 

 

 

Odor:

● Occasionally an odor may be emitted from the indoor unit. This

—

 

 

may be the result of room odors (furniture, tobacco, etc.) which

 

 

have been taken into the air conditioner.

 

 

 

 

 

 

Mist or steam are

● During Cooling or Dry operation, a thin mist may be seen emitted

 

 

emitted:

from the indoor unit. This results from the sudden Cooling of

—

 

 

room air by the air emitted from the air conditioner, resulting in

 

 

 

 

 

condensation and misting.

 

 

 

 

 

 

 

*● During Heating operation, the outdoor unit’s fan may stop, and

15

 

 

steam may be seen rising from the unit. This is due to Automatic

 

 

Defrosting operation.

 

 

 

 

 

 

Airflow is weak or stops:

*● When Heating operation is started, fan speed is temporarily very

 

 

 

low, to allow internal parts to warm up.

 

 

 

*● During Heating operation, if the room temperature rises above

—

 

 

the thermostat setting, the outdoor unit will stop, and the indoor

 

 

 

 

 

unit will operate at very low fan speed. If you wish to warm the

 

 

 

room further, set the thermostat for a higher setting.

 

 

 

 

 

 

 

*● During Heating operation, the unit will temporarily stop opera-

 

 

 

tion (between 7 and 15 minutes) as the Automatic Defrosting mode

15

 

 

operates. During Automatic Defrosting operation, the OPERATION

 

 

 

 

 

indicator light will flash.

 

 

 

 

 

 

 

● The fan may operate at very low speed during Dry operation or

6

 

 

when the unit is monitoring the room’s temperature.

 

 

 

 

 

 

 

 

 

● In the monitor AUTO operation, the fan will operate at very low

6

 

 

speed.

 

 

 

 

 

 

 

 

Water is produced from

*● During Heating operation, water may be produced by the out-

15

 

the outdoor unit:

door unit due to Automatic Defrosting operation.

 

 

 

 

 

 

En-22

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Contents English Multi Split Type 3 RoomsASU18T AOU36TSafety Precautions ContentsAIR Cleaning Filter Optional Features and FunctionsPage Name of Parts En-5 Name of PartsOutdoor Unit Intake Side F Outlet Side Time Adjust Button S Test RUN ButtonPreparation Press the Time Adjust button againTo Use the Remote Control Unit Remote Control Unit HolderPreparation To Set the Fan Speed Press the FAN Control button O To Select Mode Operation Press the START/STOP button POperation To Set the Thermostat Press the SET TEMP. buttons LTo Stop Operation Press the START/STOP button To Set the Thermostat Press the Temperature set buttonDuring Cooling/Dry mode During Fan modeTo Set the Fan Speed Press the FAN Control button To Select Mode Operation Press the START/STOP buttonOperation To Set the Thermostat Press the SET TEMP. buttonsAbout Mode Operation Set the desired times for OFF timer and on timer Timer OperationTo Use the Program timer Press the START/STOP button About the Sleep timer Sleep Timer OperationAbout the Program timer About the on timerTypes of Air flow Direction Setting Adjusting the Direction of AIR CirculationRight-Left Adjustment Adjust the Right-Left louvers Adjusting the Direction of AIR CirculationTo select Swing Operation Press the Swing Louver button R Swing OperationManual Auto Operation About Swing Operation Swing OperationTo Stop Vertical airflow Swing Operation To Stop Horizontal airflow Swing OperationAbout the Energy Save Energy Save OperationManual Auto Operation Cleaning and Care Lock the Intake Grille Cleaning the Intake Grille Open the Intake GrilleClean with water Unlock the Intake GrilleSymptom Problem TroubleshootingEn-23 Operating Tips Temperature and Humidity Range

ASU18T, Room Air Conditioner Multi Split Type (3 rooms), AOU36T specifications

The Fujitsu AOU36T is a highly efficient multi-split room air conditioning system designed to provide optimal comfort across three rooms. Its versatility and advanced technology make it an ideal solution for residential and commercial spaces. With a combination of the outdoor unit (AOU36T) and indoor units (ASU18T), this system showcases Fujitsu's commitment to quality and performance.

One of the main features of the AOU36T system is its energy efficiency, classified with a high SEER (Seasonal Energy Efficiency Ratio) rating. This means it consumes less energy while delivering powerful cooling and heating output, making it an environmentally friendly choice that also reduces utility bills. The unit is equipped with inverter technology, which allows the compressor to adjust its speed based on the cooling needs of the spaces, leading to quieter operation and increased energy savings.

The ASU18T indoor units feature a sleek and modern design that seamlessly integrates into various interior aesthetics. They are equipped with advanced air filtration systems to ensure clean and healthy air is circulated within the rooms. The filters capture dust, allergens, and other pollutants, enhancing indoor air quality, an essential aspect for families and individuals with respiratory issues.

An important characteristic of the Fujitsu AOU36T system is its ultra-quiet operation. The outdoor unit is designed to minimize noise levels, while the indoor units also operate quietly, ensuring that the comfort is not disrupted by loud mechanical sounds. This feature makes it perfect for bedrooms, offices, and other noise-sensitive environments.

The multi-split system also includes smart technology features, allowing users to control the temperature and settings remotely using a smartphone app. This provides convenience and flexibility, enabling adjustments based on individual preferences and schedules.

Moreover, the AOU36T supports heating functionality, making it a reliable choice for year-round climate control. It can effectively manage heating needs even in colder temperatures, providing warmth and comfort during winter months.

In conclusion, the Fujitsu AOU36T multi-split air conditioning system with ASU18T indoor units offers a comprehensive solution for effective climate control in multiple rooms. Its combination of energy efficiency, advanced technology, quiet operation, and smart features make it an excellent choice for those seeking comfort without compromising on performance or environmental responsibility.
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