Fujitsu Inverter ASTB09LDC User Manual

Fujitsu Inverter ASTB09LDC

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KEEP THIS OPERATION MANUAL

FOR FUTURE REFERENCE

FUJITSU GENERAL LIMITED

OPERATING MANUAL

P/N9315231017-01

Indoor Unit

ASTB09LDC

ASTB12LDC

Outdoor Unit

AOTS09LDC

AOTS12LDC

HEAT & COOL MODEL

(REVERSE CYCLE)

ROOM AIR CONDITIONER

WALL MOUNTED TYPE

R410A

REFRIGERANT

This Air Conditioner contains and operates

with refrigerant R410A and Polyol Ester oil.

THIS PRODUCT MUST ONLY BE INSTALLED OR SERVICED

BY QUALIFIED PERSONNEL.

Refer to Commonwealth, State, Territory and local legislation,

regulations, codes, installation & operation manuals, before

the installation, maintenance and/or service of this product.

Questions and Answers:

E
Eric FoxAug 14, 2025
Why is my Fujitsu Inverter ASTB09LDC not cooling properly?
- A
  Angela JamesAug 14, 2025
  Poor cooling performance in your Fujitsu Air Conditioner can stem from several factors: * A dirty air filter could be restricting airflow. * The air conditioner's intake or outlet might be blocked. * Incorrect room temperature settings on the thermostat. * Open windows or doors are letting warm air in. * Bright sunlight entering the room during cooling operation. Close the curtains. * Too many heat-generating devices or people in the room. * The unit might be set to SUPER QUIET operation, which reduces cooling power.
S
Sandra ReedAug 17, 2025
What to do if my Fujitsu Inverter ASTB09LDC doesn’t operate at all?
- J
  jgibsonAug 17, 2025
  If your Fujitsu Air Conditioner doesn't operate at all, check the following: 1. Ensure the power supply plug is properly connected to the outlet. 2. Verify there hasn't been a power failure. 3. Check if a fuse has blown or a circuit breaker has been tripped. 4. Confirm the timer is not in operation.
D
Donald GuzmanAug 21, 2025
How to fix a Fujitsu Inverter ASTB09LDC that doesn’t operate immediately?
- J
  Jennifer WilliamsAug 21, 2025
  If your Fujitsu Air Conditioner doesn't operate immediately after starting it, it may be due to a built-in delay. The compressor has a 3-minute delay to prevent fuse blowouts if the unit is stopped and immediately restarted. Also, after disconnecting and reconnecting the power, a protection circuit may prevent operation for about 3 minutes.
T
Toni HannaAug 25, 2025
Why is the airflow weak or stopping in my Fujitsu Inverter ASTB09LDC Air Conditioner?
- J
  Justin GarrettAug 26, 2025
  Weak airflow or complete stops in your Fujitsu Air Conditioner can happen for several reasons: * When heating starts, fan speed is temporarily low to warm internal parts. * During heating, if the room gets too warm, the outdoor unit stops, and the indoor unit runs at low fan speed. Set the thermostat higher if you want more heat. * The unit will temporarily stop for 7-15 minutes during heating for automatic defrosting; the OPERATION lamp will flash. * The fan may operate at very low speed during Dry operation or when monitoring room temperature. * During SUPER QUIET operation, the fan runs very slowly. * In monitor AUTO operation, the fan also runs at a very low speed.
D
Donna Dean PhDAug 28, 2025
Why is water produced from the outdoor unit of my Fujitsu Inverter ASTB09LDC Air Conditioner?
- D
  David CarlsonAug 29, 2025
  During heating operation, water may be produced from the outdoor unit of your Fujitsu Air Conditioner due to the automatic defrosting operation.
M
Miranda WoodSep 1, 2025
Why is my Fujitsu Air Conditioner emitting mist or steam?
- S
  Steven McleanSep 1, 2025
  Mist or steam emitted from your Fujitsu Air Conditioner can be normal. During Cooling or Dry operation, a thin mist may appear due to the sudden cooling of room air, causing condensation. During Heating, the outdoor unit's fan may stop and steam may rise during Automatic Defrosting.
T
Thomas EdwardsSep 5, 2025
Why does my Fujitsu Air Conditioner smell?
- J
  James RobersonSep 5, 2025
  Some smell may be emitted from the indoor unit of your Fujitsu Air Conditioner. This smell is the result of room smells (furniture, tobacco, etc.) which have been taken into the air conditioner.
K
Karen CollinsSep 9, 2025
Why is there noise coming from my Fujitsu Air Conditioner?
- J
  Judy FaulknerSep 9, 2025
  Noises from your Fujitsu Air Conditioner can be normal. The sound of water flowing in the air conditioner’s piping may be heard during operation and immediately after stopping the unit. 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. This sound is produced by the Automatic Defrosting operation.

Fujitsu Inverter ASTB09LDC Specifications

General

Brand	Fujitsu
Model	Inverter ASTB09LDC
Category	Air Conditioner
Language	English

Summary

SAFETY PRECAUTIONS

FEATURES AND FUNCTIONS

INVERTER

Explains the inverter technology for efficient temperature control and energy saving.

AUTO CHANGEOVER

Automatically switches operation modes to maintain set temperature.

PROGRAM TIMER

Allows integration of ON and OFF timer operations in a single sequence.

AIR CLEANING MODE

Purifies the air in the room using the air conditioner's power.

NAME OF PARTS

PREPARATION

Initial Setup Steps

Covers turning on power, loading batteries, and setting the current time.

Remote Control Unit Usage

Instructions on how to use the remote control unit and its holder.

OPERATION

Select Mode Operation

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

Set the Thermostat

Adjusting the desired temperature setting for heating or cooling.

Set the Fan Speed

Selecting fan speed from AUTO, HIGH, MED, LOW, or QUIET.

Super Quiet Operation

Enables quieter operation by reducing indoor unit airflow.

Stop Operation

Auto Changeover Operation Details

Explains how Auto Changeover detects and selects operating modes.

Mode Operation Details

Describes operation for Heating, Cooling, Dry, and Fan modes.

AIR CLEANING OPERATION

TIMER OPERATION

ON/OFF Timer Usage

Instructions for setting the ON timer or OFF timer for the air conditioner.

Program Timer Usage

How to set a sequence of ON and OFF timer operations.

Timer Management

Covers canceling, changing settings, stopping, and modifying timer operations.

SLEEP TIMER OPERATION

Use the Sleep Timer

How to set the sleep timer to automatically stop the air conditioner.

Sleep Timer Management

Covers changing settings, canceling, and stopping sleep timer operations.

About the Sleep Timer

Details on how the sleep timer modifies thermostat settings during operation.

ADJUSTING THE DIRECTION OF AIR CIRCULATION

Vertical Air Direction Adjustment

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

Right-Left Adjustment

How to manually adjust the horizontal airflow direction louvers.

SWING OPERATION

Swing Operation Control

Instructions for starting, stopping, and understanding swing operation.

COIL DRY OPERATION

Coil Dry Operation Control

Instructions for starting, canceling, and understanding coil dry operation.

CLEANING AND CARE

Cleaning the Intake Grille

Step-by-step instructions for cleaning the air conditioner's intake grille.

Cleaning the Air Filter

Instructions for cleaning the air filter, including washing and drying.

CLEANING THE PLASMA AIR CLEANING FILTER

Air Cleaning Check Function

Explains the indicator lamp function for air cleaning maintenance.

Cleaning the Dust Collection Unit

Detailed steps for cleaning the dust collection unit and its filter.

Cleaning the Dust Collection Unit

Air-cleaning and Deodorizing Filter Installation and Maintenance

Filter Installation/Removal

Steps for installing and removing the air-cleaning and deodorizing filter.

Filter Maintenance

Guidance on cleaning, drying, and replacing the air-cleaning filter.

TROUBLESHOOTING

OPERATING TIPS - Performance and Auto Restart

Heating Performance

Explains how heating performance is affected by outdoor temperature and heat-pump principle.

Microcomputer-controlled Automatic Defrosting

Details the automatic defrosting function during heating in cold conditions.

Auto Restart Function

Describes how the unit restarts automatically after a power interruption.

OPERATING TIPS - Usage Guidelines

Temperature and Humidity Range

Specifies the operating temperature and humidity limits for cooling, dry, and heating modes.

Tips for Saving Energy

Provides advice on reducing energy consumption during operation and standby.

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