Fujitsu AOTS18LDC - User Manual

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KEEP THIS OPERATION MANUAL

FOR FUTURE REFERENCE

FUJITSU GENERAL LIMITED

OPERATING MANUAL

P/N9315231031-01

Indoor Unit

ASTB18LDC

Outdoor Unit

AOTS18LDC

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.

Table of Contents

Questions and Answers:

K
kevinhowardSep 4, 2025
Why doesn't my Fujitsu Air Conditioner operate immediately after turning it on?
- C
  christopherwalkerSep 4, 2025
  If your Fujitsu Air Conditioner doesn’t operate immediately after being stopped and restarted, the compressor will not operate for about 3 minutes to prevent fuse blowouts. Also, whenever the Power Supply Plug is disconnected and then re- connected to a power outlet, the protection circuit will operate for about 3 minutes, preventing unit operation during that period.
T
thomaspittsSep 18, 2025
What to do if the AIR CLEAN Indicator Lamp is flashing slowly on my Fujitsu AOTS18LDC?
- D
  David HenrySep 18, 2025
  If the AIR CLEAN Indicator Lamp on your Fujitsu Air Conditioner is flashing slowly, it indicates that approximately 400 hours of Air Cleaning Mode use have passed. Stop the system, remove the mains socket, and carry out maintenance on the dust collecting unit's air filter.
T
thomas17Sep 16, 2025
What does it mean when the AIR CLEAN Indicator Lamp is flashing quickly on my Fujitsu AOTS18LDC?
- C
  Carrie ColemanSep 16, 2025
  If the AIR CLEAN Indicator Lamp on your Fujitsu Air Conditioner flashes quickly, it means that after approximately 500 hours of Air Cleaning Mode use, the Air Cleaning function will stop. To resolve this, stop the system, remove the mains socket, and perform maintenance on the dust collecting unit's air filter.
S
Sherry ValenciaSep 14, 2025
Why is the airflow weak or stopping on my Fujitsu AOTS18LDC?
- J
  John BushSep 15, 2025
  Weak or stopped airflow in your Fujitsu Air Conditioner can be due to: * When heating starts, fan speed is temporarily low to warm internal parts. * During heating, if the room is warmer than the thermostat setting, the outdoor unit stops, and the indoor unit operates at very low fan speed. Adjust the thermostat to a higher setting if you want to warm the room further. * The unit temporarily stops for 7-15 minutes during automatic defrosting; the OPERATION Indicator Lamp will flash. * The fan may operate at very low speed during dry operation or when monitoring room temperature. * The fan operates at very low speed during SUPER QUIET operation. * In monitor AUTO operation, the fan operates at very low speed.
T
Todd HarveySep 13, 2025
Why is my Fujitsu AOTS18LDC Air Conditioner making noise?
- J
  joshua95Sep 13, 2025
  You may hear noises from your Fujitsu Air Conditioner due to the following reasons: * The sound of water flowing in the air conditioner’s piping during or immediately after operation is normal. * Coolant flowing may be noticeable for the first 2 to 3 minutes after starting. * A sizzling sound during heating operation is normal and produced by the automatic defrosting operation.
T
tracymartinezSep 12, 2025
Why is there noise coming from my Fujitsu Air Conditioner?
- A
  April MclaughlinSep 12, 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.
C
clarkemilySep 9, 2025
Why does my Fujitsu Air Conditioner smell?
- D
  David CastanedaSep 9, 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.
C
Cheryl HullSep 7, 2025
Why is my Fujitsu AOTS18LDC emitting mist or steam?
- C
  christopher44Sep 7, 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.
A
Adrienne MullinsSep 6, 2025
Why is water being produced from the outdoor unit of my Fujitsu AOTS18LDC Air Conditioner?
- R
  rodriguezlaurieSep 6, 2025
  During heating operation, water may be produced from the outdoor unit of your Fujitsu Air Conditioner due to the automatic defrosting operation.
M
Michael FriedmanAug 21, 2025
Why is my Fujitsu AOTS18LDC Air Conditioner not cooling properly?
- J
  Jacqueline LopezAug 21, 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.

Fujitsu AOTS18LDC Specifications

General

Brand	Fujitsu
Model	AOTS18LDC
Category	Air Conditioner
Language	English

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