Fujitsu AST24 SERIES - User Manual

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P/N9373553021

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FUJITSU GENERAL LIMITED

OPERATING MANUAL

ROOM AIR CONDITIONER

Indoor Unit

AST18 SERIES

AST24 SERIES

AST30 SERIES

Questions and Answers:

S
Sara EspinozaAug 14, 2025
Why is my Fujitsu AST24 cooling (or heating) poorly?
- J
  Jennifer ConnerAug 14, 2025
  Poor cooling or heating performance in your Fujitsu Air Conditioner can be due to several reasons: * A dirty air filter. * Blocked intake grille or outlet port. * Incorrect room temperature settings. * Open window or door. * Bright sunlight entering the window during Cooling operation (close the curtains). * Too many people or heating apparatus and computers inside the room during Cooling operation.
M
Miranda EllisAug 17, 2025
What to do if my Fujitsu Air Conditioner doesn’t operate at all?
- W
  wwrightAug 17, 2025
  If your Fujitsu Air Conditioner doesn’t operate at all, check the following: * Has there been a power failure? * Has a fuse blown out, or a circuit breaker been tripped? * Is the timer operating?
R
Richard SmithAug 25, 2025
What to do if my Fujitsu Air Conditioner operates differently from the remote control unit’s setting?
- G
  George HoustonAug 25, 2025
  If your Fujitsu Air Conditioner operates differently from the remote control unit’s setting, check if: * The remote control unit’s batteries are dead. * The remote control unit’s batteries are loaded properly.
A
Anthony HinesAug 27, 2025
Why is water produced from the outdoor unit of my Fujitsu AST24 Air Conditioner?
- J
  Jennifer MckenzieAug 27, 2025
  During Heating operation, water may be produced from the outdoor unit of your Fujitsu Air Conditioner due to the Automatic Defrosting operation.
C
catherine08Aug 30, 2025
Why is there noise coming from my Fujitsu AST24 Air Conditioner?
- L
  logan55Aug 30, 2025
  The noises you hear from your Fujitsu Air Conditioner could be due to: * The sound of water flowing in the air conditioner’s piping during operation and immediately after stopping the unit. * The sound of coolant flowing, which may be particularly noticeable for about 2 to 3 minutes after starting operation. * A sizzling sound during Heating operation, which is produced by the Automatic Defrosting operation.
B
Brian SnyderSep 3, 2025
Why is my Fujitsu Air Conditioner emitting mist or steam?
- A
  Ashley BurnsSep 3, 2025
  The emission of mist or steam from your Fujitsu Air Conditioner can be caused by: * During Cooling or Dry operation, a thin mist may be seen 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 steam may be seen rising from the unit. This is due to the Automatic Defrosting operation.
J
Jocelyn SandersSep 6, 2025
Why Fujitsu AST24 Air Conditioner doesn't operate immediately after turning it on?
- A
  April JonesSep 6, 2025
  Your Fujitsu Air Conditioner might not operate immediately because: * If the unit is stopped and then immediately started again, the compressor will not operate for about 3 minutes, in order to prevent fuse blowouts. * Whenever the electrical breaker is turned off then on again or the power supply plug is disconnected and then reconnected, the protection circuit will operate for about 3 minutes, preventing unit operation during that period.
T
Tyler BrownSep 10, 2025
Why does my Fujitsu AST24 Air Conditioner smell?
- H
  Henry JonesSep 10, 2025
  A smell emitted from your Fujitsu Air Conditioner's indoor unit may be the result of room smells (furniture, tobacco, etc.) which have been taken into the air conditioner.

Fujitsu AST24 SERIES Specifications

General

Brand	Fujitsu
Model	AST24 SERIES
Category	Air Conditioner
Language	English

Summary

Features and Functions

Automatic Operation Modes

Explains automatic operation modes for different unit types.

Sleep Timer Functionality

Details how the sleep timer adjusts settings and turns off the unit.

Wireless Remote Control Unit

Describes the convenience and capabilities of the wireless remote control.

Omni-Directional Airflow Control

Explains three-dimensional control over air direction swing.

Removable Intake Grille

Highlights the ease of cleaning and maintenance for the intake grille.

Mildew-Resistant Air Filter

Mentions the filter treatment for cleaner use and easier care.

Super Quiet Operation Mode

Explains reduced airflow for quieter operation.

Air Cleaning Filter

Details the air cleaning and deodorizing filter features.

Preparation and Setup

Loading Remote Control Batteries

Step-by-step guide to insert batteries into the remote control.

Setting the Current Time

Instructions for setting the clock on the remote control.

Using the Remote Control Unit

Guidelines for operating the remote control effectively.

Timer Operation

Using ON;OFF Timer

Steps to set a timer for turning the unit on or off.

Using the Program Timer

Instructions for setting integrated ON and OFF timer sequences.

Sleep Timer Operation

Using the Sleep Timer

How to activate and set the sleep timer function.

Changing Sleep Timer Settings

Steps to modify existing sleep timer settings.

Manual Auto Operation

Manual Operation via Main Unit Controls

Guide to operating the unit directly from the main control panel.

Adjusting Air Circulation Direction

Vertical Air Direction Adjustment

How to adjust the up/down direction of airflow.

Horizontal Air Direction Adjustment

How to adjust the right/left direction of airflow.

Swing Operation

Vertical Airflow Swing Operation

Activating and setting vertical swing for airflow.

Horizontal Airflow Swing Operation

Activating and setting horizontal swing for airflow.

Cleaning and Care

Cleaning the Intake Grille

Instructions for removing and cleaning the front intake grille.

Cleaning the Air Filter

Steps for removing, cleaning, and replacing the air filter.

Operating Tips

Operation and Performance Details

Discusses heating performance and operational considerations.

High Temperature Operation

Explains fan behavior when indoor/outdoor temperatures are high.

Automatic Defrosting Function

Details the automatic defrosting cycle during heating.

Low Ambient Cooling Performance

Describes fan speed adjustments in low ambient temperatures.

Auto Restart Feature

Explains how the unit restarts after a power interruption.

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