Fujitsu AOT12LSAC - User Manual

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KEEP THIS OPERATION MANUAL

FOR FUTURE REFERENCE

FUJITSU GENERAL LIMITED

OPERATING MANUAL

P/N9312556052-01

Indoor Unit

AST9LSACW

AST12LSACW

Outdoor Unit

AOT9LSAC

AOT12LSAC

HEAT & COOL MODEL

(REVERSE CYCLE)

ROOM AIR CONDITIONER

WALL MOUNTED TYPE

On account of measuring the

distance from margin to

content,Cover and P16 are

printed as A4 size,The others

are printed as B5(Scale 86.5%).

Table of Contents

Questions and Answers:

K
Kathryn RiversAug 12, 2025
What to do if my Fujitsu AOT12LSAC Air Conditioner has poor cooling performance?
- W
  Wendy ScottAug 12, 2025
  If your Fujitsu Air Conditioner isn't cooling well, several factors could be the cause. First, check if the air filter is dirty and clean it if necessary. Make sure that the air conditioner's intake grille or outlet port isn't blocked. Ensure that you've correctly adjusted the thermostat settings. Also, check for open windows or doors, and close them. If it's during cooling operation and sunlight is entering the room, close the curtains. Consider if there are heat-generating appliances or too many people in the room. Finally, check if the unit is set to SUPER QUIET operation, as this can reduce cooling performance.
M
Mark JohnsonAug 16, 2025
What to do if my Fujitsu Air Conditioner doesn't operate at all?
- W
  William BrennanAug 16, 2025
  If your Fujitsu Air Conditioner isn't operating, start by checking if the power supply plug is properly connected to the outlet. Also, verify whether there has been a power failure. Finally, check if a fuse has blown out or a circuit breaker has been tripped.
G
Gregory HerreraAug 23, 2025
Why is water produced from the outdoor unit of my Fujitsu AOT12LSAC Air Conditioner?
- J
  Joshua WhiteAug 25, 2025
  During heating operation, water may be produced from the outdoor unit of your Fujitsu Air Conditioner due to the automatic defrosting operation.
I
Isaiah HowardAug 27, 2025
Why does my Fujitsu AOT12LSAC smell?
- A
  Andres GallowayAug 27, 2025
  A smell may be emitted from your Fujitsu Air Conditioner's indoor unit because room odors (from furniture, tobacco, etc.) have been drawn into the unit.
A
Alexander PattersonAug 31, 2025
Why does my Fujitsu Air Conditioner not operate immediately?
- N
  nataliestephensAug 31, 2025
  If your Fujitsu Air Conditioner is stopped and then immediately started again, the compressor will not operate for about 3 minutes to prevent fuse blowouts. Also, whenever the Power Supply Plug is disconnected and then re-connected to a power outlet, the protection circuit will operate for about 3 minutes, preventing unit operation during that period.
R
rhondamooreSep 3, 2025
Why does my Fujitsu AOT12LSAC Air Conditioner emit mist or steam?
- G
  Gregory CoxSep 3, 2025
  During cooling or dry operation, a thin mist may be seen emitted from the indoor unit of your Fujitsu Air Conditioner. This results from the sudden cooling of room air by the air emitted from the air conditioner, leading to condensation and misting. During heating operation, the outdoor unit’s fan may stop, and steam may be seen rising from the unit due to automatic defrosting operation.
W
wcardenasSep 7, 2025
Why does my Fujitsu AOT12LSAC Air Conditioner make noise?
- J
  Joseph WhiteSep 7, 2025
  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 Heating operation, a sizzling sound may be heard occasionally which is produced by the Automatic Defrosting operation.
R
randyknoxSep 10, 2025
Why does my Fujitsu Air Conditioner airflow become weak or stop?
- M
  matthewsamySep 12, 2025
  There are several reasons why the airflow in your Fujitsu Air Conditioner might weaken or stop. 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. During heating operation, the unit will temporarily stop operation (between 7 and 15 minutes) as the Automatic Defrosting mode operates. The fan may operate at very low speed during Dry operation or when the unit is monitoring the room’s temperature. During SUPER QUIET operation, the fan will operate at very low speed. Also, in the monitor AUTO operation, the fan will operate at very low speed.

Fujitsu AOT12LSAC Specifications

General

Cooling Capacity	3.5 kW
Heating Capacity	4.0 kW
Power Supply	220-240 V, 50 Hz
Refrigerant	R32
Indoor Unit Weight	9 kg
Outdoor Unit Weight	32 kg
Type	Split System
Noise Level (Outdoor)	50 dB(A)
Outdoor Unit Dimensions (W x H x D)	780 x 540 x 290 mm

Summary

OPERATING MANUAL

SAFETY PRECAUTIONS

General Safety Warnings

Essential safety guidelines for operating the air conditioner safely and preventing hazards.

FEATURES AND FUNCTIONS

Inverter Technology

Explains how the inverter adjusts power for efficient cooling and heating.

Coil Dry Operation

How to dry the indoor unit to prevent mold and bacteria growth.

Auto Changeover Mode

Automatic switching between cooling, dry, and heating modes.

Sleep Timer Function

Gradually adjusts temperature for comfortable sleep and auto shut-off.

Wireless Remote Control Unit

Convenient control of the air conditioner using a remote unit.

Swing Operation

Automatic adjustment of airflow direction for room coverage.

Removable Open Panel

Easy access for cleaning and maintenance of the indoor unit.

Mildew-Resistant Filter

Air filter treated to resist mildew for cleaner use.

Super Quiet Operation

Reduces airflow for quieter operation, ideal for nighttime use.

Optional Air Cleaning Filter

Details the optional filter for removing particulate matter.

NAME OF PARTS

PREPARATION

Power Connection and Battery Loading

Steps for connecting power supply and inserting remote control batteries.

Using the Remote Control Unit

Guidelines for operating the remote control unit effectively.

OPERATION

Selecting Operation Mode

How to choose between AUTO, COOL, DRY, FAN, and HEAT modes.

Setting the Thermostat

Adjusting the desired temperature for heating or cooling.

Setting the Fan Speed

Controlling the fan speed for optimal airflow and comfort.

Stopping Operation

How to turn off the air conditioner and its indicators.

Auto Changeover Operation Details

Explains how the unit automatically selects operating modes.

Mode Operation Details

Specifics on Heating, Cooling, Dry, and Fan modes.

TIMER OPERATION

Setting the OFF Timer

Instructions for setting the timer to turn the unit off.

Setting the ON Timer

Instructions for setting the timer to turn the unit on.

SLEEP TIMER OPERATION

Using the Sleep Timer

Setting the timer for gradual temperature adjustment during sleep.

About the Sleep Timer Function

Explains how sleep timer automatically adjusts temperature for comfort.

ADJUSTING THE DIRECTION OF AIR CIRCULATION

Vertical Air Direction Adjustment

How to adjust the up-down airflow direction using the remote.

Right-Left Airflow Adjustment

Manual adjustment of the right-left louvers for preferred airflow.

SWING OPERATION

About Swing Operation

Details on how swing operation works in different modes.

COIL DRY OPERATION

About Coil Dry Operation

Information on the purpose and effects of coil dry function.

MANUAL AUTO OPERATION

Using Main Unit Controls

How to operate the unit using controls on the main unit when the remote is unavailable.

CLEANING AND CARE

Cleaning the Open Panel

Step-by-step guide to remove and clean the indoor unit's open panel.

Cleaning the Air Filter

Instructions for cleaning and replacing the air filters.

TROUBLESHOOTING

OPERATING TIPS

Heating Performance and Considerations

Explains heat-pump operation and factors affecting heating performance.

Auto Restart Functionality

How the unit restarts automatically after a power interruption.

Temperature and Humidity Range

Recommended operating ranges for cooling, dry, and heating modes.

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