Fujitsu AWT24LB - User Manual

Questions and Answers

J
Jennifer AdamsAug 15, 2025
Why is my Fujitsu AWT24LB Air Conditioner not cooling or heating properly?
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  Lisa LangAug 15, 2025
  Several factors can affect the cooling or heating performance of your Fujitsu Air Conditioner. Check if the air filter is dirty, or if the air conditioner’s intake filter or outlet port is blocked. Ensure that you have adjusted the thermostat correctly. Also, check for open windows or doors. If you are using Cooling operation, close the curtains if sunlight is entering the room. Finally, consider if there are heating apparatus, computers, or too many people in the room.
D
Derrick SandovalAug 18, 2025
What to do if my Fujitsu Air Conditioner doesn't operate at all?
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  Glenn CastroAug 18, 2025
  If your Fujitsu Air Conditioner doesn't operate, check if there has been a power failure. Also, verify if a fuse has blown out or a circuit breaker has been tripped. Finally, check if the timer is operating.
G
georgehillAug 21, 2025
What to do if Fujitsu AWT24LB Air Conditioner doesn’t operate immediately?
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  sarah13Aug 22, 2025
  If the 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 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.
W
Whitney NolanAug 26, 2025
Why does my Fujitsu AWT24LB Air Conditioner have weak airflow or stop?
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  Monica RobertsAug 26, 2025
  There are several reasons why your Fujitsu Air Conditioner's airflow might be weak 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; set the thermostat to a higher setting if you wish to warm the room further. The unit will temporarily stop operation (between 7 and 15 minutes) during Heating operation 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. In the monitor AUTO operation, the fan will operate at very low speed.
L
Lauren RileyAug 28, 2025
How to fix Fujitsu AWT24LB operating differently from remote control settings?
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  James YoungAug 28, 2025
  If your Fujitsu Air Conditioner operates differently from the remote control's settings, check if the remote control's batteries are dead or if they are loaded properly.
A
ashleycharleneAug 31, 2025
Why is my Fujitsu AWT24LB producing water from the outdoor unit?
- S
  Sarah WhiteAug 31, 2025
  During Heating operation, water may be produced from the outdoor unit due to the Automatic Defrosting operation.
J
Joseph CameronSep 4, 2025
Why does my Fujitsu AWT24LB Air Conditioner emit mist or steam?
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  Laurie HarrisSep 4, 2025
  During Cooling or Dry operation, a thin mist may be emitted from the indoor unit due to the sudden cooling of room air, resulting in condensation. During Heating operation, the outdoor unit’s fan may stop, and steam may rise from the unit due to the Automatic Defrosting operation.
D
Denise AdkinsSep 7, 2025
Why does my Fujitsu Air Conditioner make noise?
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  Michael GriffinSep 8, 2025
  During operation and immediately after stopping the unit, the sound of water flowing in the air conditioner’s piping may be heard. During operation, a slight squeaking sound may occur due to minute expansion and contraction of the front cover because of temperature changes. During Heating operation, a sizzling sound may be heard occasionally, produced by the Automatic Defrosting operation.
B
Brenda ArroyoSep 12, 2025
Why does my Fujitsu AWT24LB Air Conditioner smell?
- N
  Nancy RobertsSep 12, 2025
  Some smell may be emitted from the indoor unit. This smell is the result of room smells (furniture, tobacco, etc.) which have been taken into the air conditioner.

This document is an operating manual for a Fujitsu Ceiling Wall Type Inverter Air Conditioner. It covers the indoor units AWT24LB and AWT30LB, and outdoor units AOT24LM and AOT30LM.

Function Description

The Fujitsu Ceiling Wall Type Inverter Air Conditioner is designed for both heating and cooling, offering various operational modes to suit user preferences and room conditions. It features an "AUTOMATIC OPERATION" mode where the unit selects the appropriate mode (Heating, Cooling, or Monitor) based on the thermostat setting and actual room temperature. The "SLEEP TIMER" function adjusts the thermostat setting gradually during sleep to prevent excessive warming or cooling, then automatically turns off the unit. For quieter operation, the "SUPER QUIET OPERATION" mode reduces the indoor unit's airflow. The unit also boasts "OMNI-DIRECTIONAL AIR FLOW (SWING OPERATION)" for three-dimensional control of air direction, utilizing both UP/DOWN and RIGHT/LEFT air direction swings.

Important Technical Specifications

Refrigerant: R410A
Oil Type: Polyol Ester oil
Indoor Unit Models: AWT24LB, AWT30LB
Outdoor Unit Models: AOT24LM, AOT30LM
Thermostat Setting Range:
- AUTO: 18 to 30 °C
- Heating: 16 to 30 °C
- Cooling/Dry: 18 to 30 °C
Remote Control Operating Range: About 7 meters
Power Interruption Recovery: AUTO Restart function restores previous settings after power failure.
Air Cleaning Filters:
- Air Purifying Filter (Wasabi Filter): Catches dust mites, tobacco smoke, pollutants, mold, and bacteria. Normal life is about three months.
- Deodorizing Filter (Light Recovery Filter): Absorbs tobacco smoke, pet dander, and other contaminants. Regenerated by sunlight every six months; no replacement needed for three years under normal conditions.

Usage Features

The air conditioner is controlled primarily via a wireless remote control unit.

Operating Modes:

START/STOP Button: Initiates or ceases operation.
MASTER CONTROL Button: Cycles through operating modes: AUTO, HEAT, COOL, DRY, FAN.
SET TEMP. Buttons (∧/∨): Adjusts the thermostat setting.
FAN CONTROL Button: Selects fan speed: AUTO, HIGH, MED, LOW, QUIET. In DRY mode, fan speed cannot be changed manually.
TIMER Operation:
- ON Timer: Starts operation at a set time.
- OFF Timer: Stops operation at a set time.
- PROGRAM Timer: Combines ON and OFF timer operations within a 24-hour period.
SLEEP Timer: Sets the duration of operation before automatic shutdown, with gradual temperature adjustments for comfort.
MANUAL AUTO Operation: A button on the main unit allows basic AUTO mode operation (23 °C thermostat, AUTO fan speed) if the remote control is unavailable.

Airflow Direction Control:

AIR FLOW DIRECTION VERTICAL SET Button: Adjusts UP/DOWN air direction flaps. Ranges vary by mode (Cooling/Dry: 1-3; Heating: 1-4, 6).
AIR FLOW DIRECTION HORIZONTAL SET Button: Adjusts RIGHT/LEFT air direction louvers.
SWING Operation:
- VERTICAL SWING: Automatically swings UP/DOWN flaps.
- HORIZONTAL SWING: Automatically swings RIGHT/LEFT louvers.
- Swing range is relative to the currently set airflow direction.

Safety Precautions:

Installation and servicing must be performed by qualified personnel.
Do not insert fingers or objects into outlets/grilles.
Avoid direct exposure to cold air for extended periods.
Do not operate with wet hands.
Turn off power before cleaning or extended non-use.
Do not block intake grille or outlet port.
Keep electronic equipment at least one meter away.
Avoid installing near fireplaces or heating apparatus.
Do not use inflammable gases near the unit.

Maintenance Features

Intake Filters:

Removal: Fingers in grids, lift up, pull out.
Cleaning: Vacuum or wash with mild detergent and warm water. Dry thoroughly in a shady place.
Frequency: Clean every five weeks under normal use.
Installation: Hang edge on body, push forward to secure.
Mildew-Resistant: Treated to resist mildew growth.

Air Cleaning Filters (Air Purifying Filter and Deodorizing Filter):

Installation:
1. Remove intake filters.
2. Remove holder from each filter frame.
3. Attach holder and air purifying/deodorizing filter to the filter frame (hooks on holder should hook filter frame).
4. Install intake filters with attached air cleaning filters into the indoor unit.
Maintenance:
- Air Purifying Filter: Replace every three months (or sooner if dirty). Do not wash or reuse. Purchase replacement (UTR-FB11) from parts dealer.
- Deodorizing Filter: Do not wash. Regenerate by vacuuming dust and placing in direct sunlight for six hours every six months. No replacement needed for three years.
Precautions: Do not place near stoves or hot appliances. Set fan speed to HIGH for increased efficiency when using these filters.

General Maintenance:

Regular inspection by authorized service personnel is recommended for units used for extended periods.
When cleaning the unit's body, use water cooler than 40 °C; avoid harsh abrasive cleansers, volatile agents, liquid insecticides, or hairsprays.
Before shutting down for a month or more, operate in fan mode for half a day to dry internal parts.