Fujitsu AST18FB User Manual

Fujitsu AST18FB

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AIR CONDITIONER

WALL MOUNTED TYPE

KEEP THIS MANUAL

FOR FUTURE REFERENCE

FUJITSU GENERAL LIMITED

OPERATING MANUAL

Indoor Unit

AST18FB

AST18UB

AST24FB

AST24UB

AST30FB

AST30UB

Outdoor Unit

AOT18F

AOT18U

AOT24F

AOT24U

AOT30F

AOT30U

P/N9369993022

Questions and Answers:

S
Sarah ReynoldsAug 15, 2025
Why is my Fujitsu AST18FB Air Conditioner cooling/heating poorly?
- P
  pkirkAug 16, 2025
  Several factors can cause poor cooling or heating performance in your Fujitsu Air Conditioner. Check the following: * Ensure the air filter is clean. * Make sure the air conditioner's intake grille or outlet port isn't blocked. * Verify that the room temperature settings (thermostat) are correctly adjusted. * Check if any windows or doors are open. * If it's cooling operation, close curtains to block bright sunlight. Also, consider if there are too many people, heating apparatus, or computers in the room.
G
gwilliamsAug 18, 2025
Why is water coming from my Fujitsu AST18FB Air Conditioner outdoor unit?
- A
  Amy SingletonAug 18, 2025
  During heating operation, water may be produced from the outdoor unit of your Fujitsu Air Conditioner due to the automatic defrosting operation.
S
staciejohnsonAug 22, 2025
What to do if the Fujitsu Air Conditioner signal is not received after replacing remote batteries?
- K
  Kelly McbrideAug 22, 2025
  If the signal isn't received after replacing the batteries in your Fujitsu Air Conditioner's remote control, ensure you're using signal code A. The unit may not respond if another signal code is selected.
B
Brandi StrongAug 25, 2025
Why doesn't my Fujitsu Air Conditioner operate immediately?
- E
  Erica RamirezAug 25, 2025
  Your Fujitsu Air Conditioner might not operate immediately after being turned on due to a protection mechanism. If the unit is stopped and immediately restarted, the compressor won't operate for about 3 minutes to prevent fuse blowouts. Similarly, if the electrical breaker is turned off and on again, or the power supply is disconnected and reconnected, the protection circuit will prevent operation for about 3 minutes.

Fujitsu AST18FB Specifications

General

Brand	Fujitsu
Model	AST18FB
Category	Air Conditioner
Language	English

Summary

Fujitsu Air Conditioner Operating Manual

Safety Precautions

General Safety Warnings

Defines DANGER, WARNING, and CAUTION symbols and their meanings for safe operation.

Name of Parts Identification

Indoor Unit Components

Outdoor Unit Components

Remote Control Unit Components

Preparation and Setup

Loading Remote Control Batteries

Instructions for inserting batteries into the remote control unit.

Setting Current Time on Remote

Basic Operation

Selecting Operating Modes

How to select AUTO, COOL, DRY, HEAT, and FAN modes for various conditions.

Setting Thermostat and Fan Speed

Instructions for adjusting temperature settings and fan speed levels.

Mode Operation Details

Explanation of AUTO, Heating, Cooling, Dry, and Fan mode specific behaviors.

Timer Operations

Setting ON/OFF and Program Timers

Managing Timer Functions

Air Circulation Direction Adjustment

Vertical Airflow Adjustment

Horizontal Airflow Adjustment

Cleaning and Care

Cleaning Unit Components

Instructions for cleaning the intake grille and air filter for optimal performance.

Remote Control Signal Code Selection

Changing Signal Codes

Troubleshooting Guide

Symptom-Based Troubleshooting

Common symptoms and their possible problems and solutions for quick diagnosis.

Comprehensive Checks

Further checks for operation failure, performance issues, and remote signal problems.

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