Fujitsu ASTA12LFC User Manual (English)

Questions and Answers:

J
Jack BaileyAug 14, 2025
Why is my Fujitsu ASTA12LFC not cooling properly?
- K
  Katherine HoffmanAug 15, 2025
  Several factors might be affecting the cooling performance of your Fujitsu Air Conditioner. Check if the air filter is dirty, or if the air intake grille or outlet port is blocked. Ensure the room temperature settings (thermostat) are correctly adjusted. Also, check for open windows or doors, bright sunlight entering the room (close the curtains), and the presence of heat-generating equipment or too many people in the room. Finally, make sure the unit is not set to SUPER QUIET operation.
J
Jonathan SandersAug 18, 2025
What to do if my Fujitsu ASTA12LFC doesn't operate at all?
- N
  nicole84Aug 18, 2025
  If your Fujitsu Air Conditioner isn't operating, first check if the power supply plug is disconnected from the outlet. Also, verify if there has been a power failure, or if a fuse has blown out or a circuit breaker has been tripped. Finally, check if the timer is operating.
T
Tyler TuckerAug 21, 2025
Why Fujitsu Air Conditioner doesn’t operate immediately?
- R
  Rebecca TaylorAug 21, 2025
  Your Fujitsu Air Conditioner might not operate immediately after being started due to a built-in protection mechanism. If the unit is stopped and then immediately restarted, the compressor will not operate for about 3 minutes to prevent fuse blowouts. Similarly, if the power supply plug is disconnected and then reconnected, the protection circuit will prevent operation for about 3 minutes.
J
Jerome HowardAug 25, 2025
Why is water produced from the outdoor unit of my Fujitsu ASTA12LFC Air Conditioner?
- J
  Jeremiah JamesAug 26, 2025
  Water may be produced from the outdoor unit of your Fujitsu Air Conditioner during heating operation because of the automatic defrosting process.
R
Robin BeardAug 28, 2025
Why is my Fujitsu ASTA12LFC airflow weak or stops?
- A
  Alexandra JonesAug 28, 2025
  Weak or absent airflow in your Fujitsu Air Conditioner can occur for multiple reasons. When heating starts, the fan speed is temporarily low to allow internal parts to warm up. During heating, if the room temperature exceeds the thermostat setting, the outdoor unit stops, and the indoor unit operates at very low fan speed; set a higher thermostat if you want to warm the room further. The unit will also temporarily stop during Automatic Defrosting (7-15 minutes), indicated by a flashing DEFROST lamp. Furthermore, the fan runs at very low speed during Dry operation, when monitoring room temperature, during SUPER QUIET operation, and in monitor AUTO operation.
S
Steven CurryAug 31, 2025
Why does my Fujitsu ASTA12LFC Air Conditioner smell?
- K
  Kevin GrayAug 31, 2025
  The smell emitted from your Fujitsu Air Conditioner's indoor unit could be due to room odors (from furniture, tobacco, etc.) that have been drawn into the unit.
J
Julie KeySep 3, 2025
Why does my Fujitsu ASTA12LFC emit mist or steam?
- R
  Rebecca ArroyoSep 3, 2025
  The emission of mist or steam from your Fujitsu Air Conditioner can happen for two reasons. During Cooling or Dry operation, a thin mist may appear due to the rapid cooling of room air, causing condensation. During Heating, steam may rise from the outdoor unit when the fan stops, which is a result of the Automatic Defrosting operation.
R
Raymond HoodSep 6, 2025
Why is my Fujitsu ASTA12LFC making noise?
- J
  James RobinsonSep 6, 2025
  The noises you hear from your Fujitsu Air Conditioner can be normal. The sound of water flowing in the pipes may be heard during and immediately after operation. Coolant flowing may be noticeable for 2-3 minutes after starting. During heating, a sizzling sound may occur occasionally due to automatic defrosting.
K
Kathy ChaseSep 12, 2025
Why is my Fujitsu ASTA12LFC unit operating differently from the remote control setting?
- E
  Edward LawsonSep 12, 2025
  If your Fujitsu Air Conditioner unit is operating differently from the remote control's settings, check if the remote control's batteries are dead or if they are loaded properly.

Fujitsu ASTA12LFC Specifications

General

Brand	Fujitsu
Model	ASTA12LFC
Category	Air Conditioner
Language	English

Summary

Features and Functions

Inverter Operation

Explains the inverter technology for efficient operation and temperature control.

Coil Dry Operation

Details how to use the Coil Dry function to prevent mold and bacteria.

Auto Changeover

Describes automatic switching between cooling, dry, and heating modes.

10°C Heat Operation

Explains how to maintain a minimum room temperature of 10°C.

Program Timer

Covers setting integrated ON and OFF timers within a 24-hour period.

Sleep Timer

Describes how the sleep timer adjusts temperature gradually and turns off the unit.

Wireless Remote Control Unit

Introduces the wireless remote control for convenient operation.

Wired Remote Control Unit (Option)

Details the optional wired remote control and its functions.

Horizontal Airflow for Cooling

Explains horizontal airflow settings for cooling mode.

Downward Airflow for Heating

Explains downward airflow settings for heating mode.

Omni-Directional Air Flow (Swing Operation)

Describes three-dimensional air direction control using swing.

Removable Open Panel

Highlights the removable panel for easy cleaning and maintenance.

Mildew-Resistant Filter

Mentions the mildew-resistant filter for cleaner use.

Super Quiet Operation

Explains the super quiet operation mode for reduced noise.

Polyphenol Catechin Air Cleaning Filter

Describes the air cleaning filter that removes fine particles and bacteria.

Negative Air Ions Deodorizing Filter

Details the filter that produces negative ions for deodorizing.

Name of Parts

Indoor Unit Components

Details the components and controls of the indoor unit.

Outdoor Unit Components

Lists the components of the outdoor unit.

Remote Control Unit Controls

Identifies buttons and functions on the remote control.

Remote Control Unit Display

Explains the indicators and display elements on the remote control.

Preparation

Turn on the Power

Instructions for connecting the power supply and turning on the unit.

Load Batteries

Guide on how to insert batteries into the remote control unit.

Set the Current Time

Steps to set the current time on the remote control unit.

Using the Remote Control Unit

Information on operating the remote control unit and its range.

Remote Control Unit Holder

Instructions for mounting and using the remote control holder.

Operation

To Select Mode Operation

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

To Set the Thermostat

Instructions for setting the desired temperature for operation.

To Set the Fan Speed

Guide on adjusting fan speed (AUTO, HIGH, MED, LOW, QUIET).

Super Quiet Operation

Details on activating and understanding the super quiet fan mode.

To Stop Operation

How to turn off the air conditioner using the START/STOP button.

About Auto Changeover Operation

Explanation of how the unit automatically selects operating modes.

About Mode Operation

Details on specific operations for Heating, Cooling, Dry, and Fan modes.

Timer Operation

To Use the ON Timer or OFF Timer

Steps to set a single ON or OFF timer for the unit.

To Use the Program Timer

How to set a sequence of ON and OFF timers.

About the Program Timer

Explains the functionality and examples of program timer use.

Sleep Timer Operation

To Use the Sleep Timer

Instructions for activating the sleep timer function.

To Change the Timer Settings

How to adjust the sleep timer duration.

About the Sleep Timer

Details how the sleep timer modifies temperature settings during operation.

Adjusting the Direction of Air Circulation

Vertical Air Direction Adjustment

How to set the vertical airflow direction using the remote control.

Horizontal Air Direction Adjustment

How to set the horizontal airflow direction using the remote control.

Swing Operation

To Select Swing Operation

Procedure to activate the airflow swing function.

To Stop Swing Operation

How to deactivate the airflow swing.

About Swing Operation

Explanation of swing modes and conditions.

Coil Dry Operation

To Select Coil Dry Operation

How to initiate the Coil Dry mode to dry the indoor unit.

To Cancel Coil Dry Operation

Procedure to stop the Coil Dry operation.

About Coil Dry Operation

Details on the Coil Dry function's duration and limitations.

10°C Heat Operation

To Use 10°C Heat Operation

How to activate the 10°C heat mode.

To Stop 10°C Heat Operation

How to stop the 10°C heat mode.

About the 10°C Heat Operation

Notes on when the 10°C heat mode operates or is limited.

Manual Auto Operation

How To Use the Main Unit Controls

Instructions for operating the unit using main unit controls.

Cleaning and Care

Cleaning the Open Panel

Instructions for removing, cleaning, and reattaching the open panel.

Cleaning the Air Filter

Guide on cleaning the air filters by vacuuming or washing.

Air Cleaning Filter Installation

Replacing Dirty Air Cleaning Filters

Maintenance of Deodorizing Filters

Troubleshooting

Unit Does Not Operate Immediately

Troubleshooting steps for when the unit does not start immediately.

Noise During Operation

Common noises heard during operation and their causes.

Unusual Smells

Identifying and addressing unusual odors from the unit.

Mist or Steam Emission

Explains mist or steam seen during cooling/dry operations.

Weak or Stopped Airflow

Troubleshooting weak or no airflow issues.

Water Produced from Outdoor Unit

Reasons for water production from the outdoor unit.

Unit Does Not Operate At All

Checks for when the unit does not operate at all.

Poor Cooling Performance

Troubleshooting steps for reduced cooling performance.

Operation Differs from Setting

Diagnosing issues where unit operation differs from settings.

Operating Tips

Heating Performance

Notes on heating efficiency and limitations.

Microcomputer-controlled Automatic Defrosting

Explanation of the automatic defrosting function.

Auto Restart

Details on how the unit restarts after a power interruption.

Temperature and Humidity Range

Specifies the operating temperature and humidity ranges for each mode.

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16 pages

Fujitsu ASTA12LFC User Manual

Table of Contents

Questions and Answers:

Fujitsu ASTA12LFC Specifications

Summary

Features and Functions

Inverter Operation

Coil Dry Operation

Auto Changeover

10°C Heat Operation

Program Timer

Sleep Timer

Wireless Remote Control Unit

Wired Remote Control Unit (Option)

Horizontal Airflow for Cooling

Downward Airflow for Heating

Omni-Directional Air Flow (Swing Operation)

Removable Open Panel

Mildew-Resistant Filter

Super Quiet Operation

Polyphenol Catechin Air Cleaning Filter

Negative Air Ions Deodorizing Filter

Name of Parts

Indoor Unit Components

Outdoor Unit Components

Remote Control Unit Controls

Remote Control Unit Display

Preparation

Turn on the Power

Load Batteries

Set the Current Time

Using the Remote Control Unit

Remote Control Unit Holder

Operation

To Select Mode Operation

To Set the Thermostat

To Set the Fan Speed

Super Quiet Operation

To Stop Operation

About Auto Changeover Operation

About Mode Operation

Timer Operation

To Use the ON Timer or OFF Timer

To Use the Program Timer

About the Program Timer

Sleep Timer Operation

To Use the Sleep Timer

To Change the Timer Settings

About the Sleep Timer

Adjusting the Direction of Air Circulation

Vertical Air Direction Adjustment

Horizontal Air Direction Adjustment

Swing Operation

To Select Swing Operation

To Stop Swing Operation

About Swing Operation

Coil Dry Operation

To Select Coil Dry Operation

To Cancel Coil Dry Operation

About Coil Dry Operation

10°C Heat Operation

To Use 10°C Heat Operation

To Stop 10°C Heat Operation

About the 10°C Heat Operation

Manual Auto Operation

How To Use the Main Unit Controls

Cleaning and Care

Cleaning the Open Panel

Cleaning the Air Filter

Air Cleaning Filter Installation

Replacing Dirty Air Cleaning Filters

Maintenance of Deodorizing Filters

Troubleshooting

Unit Does Not Operate Immediately

Noise During Operation

Unusual Smells

Mist or Steam Emission

Weak or Stopped Airflow

Water Produced from Outdoor Unit

Unit Does Not Operate At All