Fujitsu ASTB18LDC - 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:

R
Robert MitchellSep 12, 2025
Why is there noise coming from my Fujitsu ASTB18LDC?
- B
  Brandon SmithSep 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.
R
Robin SimonAug 22, 2025
What to do if my Fujitsu ASTB18LDC doesn’t operate at all?
- N
  nicoledavisAug 22, 2025
  If your Fujitsu Air Conditioner doesn't operate at all, check the following: 1. Ensure the power supply plug is properly connected to the outlet. 2. Verify there hasn't been a power failure. 3. Check if a fuse has blown or a circuit breaker has been tripped. 4. Confirm the timer is not in operation.
J
Joshua LittleAug 25, 2025
How to fix a Fujitsu Air Conditioner that doesn’t operate immediately?
- D
  daniel14Aug 25, 2025
  If your Fujitsu Air Conditioner doesn't operate immediately after starting it, it may be due to a built-in delay. The compressor has a 3-minute delay to prevent fuse blowouts if the unit is stopped and immediately restarted. Also, after disconnecting and reconnecting the power, a protection circuit may prevent operation for about 3 minutes.
T
Teresa PattersonAug 27, 2025
What to do if my Fujitsu ASTB18LDC doesn't operate at all?
- P
  Patricia WilsonAug 27, 2025
  If your Fujitsu Air Conditioner doesn't operate, check the following: * Ensure the power supply plug is properly connected to the outlet. * Check for a power failure. * See if a fuse has blown or a circuit breaker has tripped. * Verify the timer is not in operation.
J
Jacob GonzalesAug 28, 2025
Why is the airflow weak or stopping in my Fujitsu ASTB18LDC?
- K
  Kent BergerAug 28, 2025
  Weak airflow or complete stops in your Fujitsu Air Conditioner can happen for several reasons: * When heating starts, fan speed is temporarily low to warm internal parts. * During heating, if the room gets too warm, the outdoor unit stops, and the indoor unit runs at low fan speed. Set the thermostat higher if you want more heat. * The unit will temporarily stop for 7-15 minutes during heating for automatic defrosting; the OPERATION lamp will flash. * The fan may operate at very low speed during Dry operation or when monitoring room temperature. * During SUPER QUIET operation, the fan runs very slowly. * In monitor AUTO operation, the fan also runs at a very low speed.
M
Mr. Anthony FranklinAug 30, 2025
Why is water produced from the outdoor unit of my Fujitsu ASTB18LDC Air Conditioner?
- T
  Tracy KingAug 30, 2025
  During heating operation, water may be produced from the outdoor unit of your Fujitsu Air Conditioner due to the automatic defrosting operation.
A
Ann PetersonSep 18, 2025
What to do if the AIR CLEAN Indicator Lamp is flashing slowly on my Fujitsu Air Conditioner?
- R
  Rebecca RamosSep 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.
L
Logan RobertsSep 12, 2025
Why is my Fujitsu ASTB18LDC making noise?
- C
  cserranoSep 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.
M
Michael AguirreSep 9, 2025
Why does my Fujitsu ASTB18LDC smell?
- K
  Krystal BeckerSep 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.
N
Nicole AndersonSep 5, 2025
Why is water being produced from the outdoor unit of my Fujitsu Air Conditioner?
- J
  Jerome HuntSep 6, 2025
  During heating operation, water may be produced from the outdoor unit of your Fujitsu Air Conditioner due to the automatic defrosting operation.

Fujitsu ASTB18LDC Specifications

General

Brand	Fujitsu
Model	ASTB18LDC
Category	Air Conditioner
Language	English

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