Fujitsu ASTG18KMCB - User Manual

Questions and Answers

D
dsanchezAug 11, 2025
Why is my Fujitsu Air Conditioner not cooling or heating properly?
- K
  kara23Aug 12, 2025
  Poor cooling or heating performance in your Fujitsu Air Conditioner can occur if the air filter is dirty, the intake grille or outlet port of the indoor unit is blocked, or the room temperature is not adjusted correctly. Check if a window or door is left open, if direct sunlight is entering the room, or if there are too many people or heat-generating devices in the room. Also, verify that the fan speed is not set to “QUIET” (which prioritizes noise reduction over performance) and that the OUTDOOR UNIT LOW NOISE mode is not enabled. Finally, check with your electric company to see if you have an arrangement for Demand Response.
A
Abigail BryantAug 21, 2025
What to do if my Fujitsu ASTG18KMCB does not turn on?
- J
  James FergusonAug 21, 2025
  If your Fujitsu Air Conditioner doesn't operate at all, first check if the circuit breaker has been turned off. Also, verify if there has been a power outage. Ensure that a fuse hasn't blown or the circuit breaker hasn't been tripped. Finally, confirm that the timer is operating correctly.
G
Gary BauerSep 1, 2025
Why is my Fujitsu ASTG18KMCB Air Conditioner not responding to the remote?
- A
  Aaron CastroSep 1, 2025
  If your Fujitsu Air Conditioner operates differently from the remote controller setting, it might be due to exhausted batteries in the remote controller, or the batteries may not be loaded properly. Please, check the batteries.

This document is an operating manual for a Fujitsu wall-mounted air conditioner, specifically models ASTG18KMCB, ASTG22KMCB, and ASTG24KMCB. It provides comprehensive information on safety, operation, maintenance, and troubleshooting.

Function Description:

The Fujitsu wall-mounted air conditioner is designed to provide cooling, heating, and dehumidification for indoor spaces. It utilizes R32 refrigerant, a flammable refrigerant, and is equipped with various features to enhance comfort, energy efficiency, and user convenience. Key functions include:

Cooling/Heating/Dry/Fan Modes: Allows users to select the desired operating mode for temperature control and air circulation.
POWERFUL Operation: Activates maximum power and strong airflow for rapid cooling or heating.
10 °C HEAT Operation: Maintains a room temperature of 10 °C to prevent it from dropping too low, useful for unoccupied spaces in cold climates.
Human Sensor (Energy Saving Program): Detects human presence to automatically adjust temperature settings, promoting energy efficiency.
Demand Response: Compatible with electricity supplier demand response programs, allowing the unit to operate in reduced capacity modes (DR mode 1, 2, 3) to save energy during peak demand.
Timer Operations: Includes ON timer, OFF timer, Program timer (combined ON/OFF), WEEKLY timer (up to 4 programs per day, 28 per week), and SLEEP timer for scheduled operation and comfortable sleep.
Airflow Direction Control: Independent control of vertical and horizontal airflow direction louvers for customized air distribution.
Air Cleaning Filters: Purifies and deodorizes the air, providing fresh airflow. Includes Apple-catechin filters and Ion deodorization filters.
Auto-restart Function: Automatically resumes previous operation settings after a power interruption.
Automatic Defrosting Operation: Prevents frost buildup on the outdoor unit during heating in low temperatures and high humidity, maintaining performance.

Important Technical Specifications:

Refrigerant: R32 (flammable refrigerant). Installation and servicing must be performed by qualified personnel.
Temperature Setting Range:
- AUTO/COOL/DRY mode: 18.0-30.0 °C
- HEAT mode: 16.0-30.0 °C (10 °C HEAT operation maintains 10 °C)
Permissible Temperature and Humidity Range:
- COOL/DRY: Indoor temperature 18-32 °C, Indoor humidity below approximately 80%.
- HEAT: Indoor temperature 16-30 °C.
Remote Controller Operating Range: Approximately 7 meters.
Air Cleaning Filters:
- Apple-catechin filter: UTR-FA16 (disposable, replace every 3 months under normal use).
- Ion deodorization filter: UTR-FA16-2 (clean every 3 months, replace every 3 years under normal use).
Power Supply: Not explicitly stated but implied to be standard residential/commercial electrical supply.
Wireless LAN Control: Built-in adapter for control via mobile app (requires separate setting manual).

Usage Features:

Remote Controller: A comprehensive remote controller allows for selection of modes, temperature, fan speed (Auto, High, Med, Low, Quiet), swing operation (Up/down, Left/right, Up/down/left/right, Stop swing), and various timer settings. It also features a signal transmit indicator and a display for current settings.
Custom Code Setting: Allows for setting a custom code on the remote controller to prevent interference when multiple air conditioners are installed in the same room (4 selections possible: A, B, C, D).
MANUAL AUTO Button: Located on the indoor unit, this button allows for basic operation (Stop, AUTO, Forced cooling) in case the remote controller is lost or malfunctions. It also serves to reset the filter indicator.
Human Sensor (ENERGY SAVING PROGRAM): Activated via the SENSOR button on the remote controller. Automatically adjusts temperature when no one is detected in the room for approximately 20 minutes (increases 2°C in COOL/DRY, decreases 4°C in HEAT).
Demand Response (DR) Modes: When activated by the electricity supplier, the unit automatically switches to a reduced capacity mode (DR mode 1: compressor off; DR mode 2: 50% energy consumption; DR mode 3: 75% energy consumption). The OPERATION indicator blinks to signify DR mode.
Timer Functions:
- ON/OFF Timer: Sets specific ON or OFF times.
- Program Timer: Combines ON-OFF or OFF-ON timers.
- SLEEP Timer: Gradually adjusts temperature for comfortable sleep, then turns off the unit.
- WEEKLY Timer: Allows scheduling up to 4 ON/OFF programs per day for each day of the week, with customizable temperature settings for ON programs.
Wired Remote Controller (Option): An optional wired remote controller can be used, offering additional functions like a temperature setback timer. It can be used in conjunction with the wireless remote controller, though some wireless functions may be restricted.
Indicator Lights:
- OPERATION indicator (green): Lights during normal operation, blinks during Automatic Defrosting and Demand Response.
- ECONOMY indicator (green): Lights during ECONOMY operation and 10 °C HEAT operation, blinks when air filter cleaning is due.
- TIMER indicator (orange): Lights during TIMER operation, blinks slowly for timer setting errors.

Maintenance Features:

Air Filter Cleaning: Regular cleaning of air filters (every 2 weeks under normal use) is crucial for maintaining product performance and preventing airflow reduction or increased operating noise. The manual provides detailed steps for removing, cleaning (with vacuum or washing with neutral detergent and warm water), drying, and reinstalling the intake grille and air filters.
Air Cleaning Filter Replacement/Maintenance:
- Apple-catechin filter: Disposable, replace every 3 months.
- Ion deodorization filter: Clean every 3 months by flushing with high-pressure hot water and gentle washing with neutral detergent; replace every 3 years.
Filter Indicator Reset: The ECONOMY indicator lamp flashes (3 times, at 21-second intervals) when it's time to clean the air filters. After cleaning, reset the indicator by pressing the "MANUAL AUTO" button on the indoor unit for 3 seconds or less.
Extended Non-Use: If the unit has been shut down for a month or more, perform FAN operation for half a day to dry internal parts thoroughly before normal operation.
Additional Inspection: After long periods of use, accumulated dust may reduce performance, and a product inspection by authorized service personnel is recommended.
Troubleshooting Guide: Provides a list of common symptoms, their causes (normal functions or characteristics), and diagnostic checks to perform before calling for service. This includes checks for power supply, timer operation, dirty filters, blocked grilles, and remote controller battery status.
Safety Precautions: Emphasizes the importance of disconnecting power before cleaning, avoiding contact with aluminum fins, not using liquid insecticides or hair sprays on the unit, and not standing on unstable surfaces during maintenance.