Fujitsu AST12LSACW User Manual

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KEEP THIS OPERATION MANUAL

FOR FUTURE REFERENCE

FUJITSU GENERAL LIMITED

OPERATING MANUAL

P/N9312556052-01

Indoor Unit

AST9LSACW

AST12LSACW

Outdoor Unit

AOT9LSAC

AOT12LSAC

HEAT & COOL MODEL

(REVERSE CYCLE)

ROOM AIR CONDITIONER

WALL MOUNTED TYPE

On account of measuring the

distance from margin to

content,Cover and P16 are

printed as A4 size,The others

are printed as B5(Scale 86.5%).

Table of Contents

Questions and Answers:

M
Mark PerkinsAug 12, 2025
What to do if my Fujitsu AST12LSACW Air Conditioner has poor cooling performance?
- C
  charlesbryantAug 13, 2025
  If your Fujitsu Air Conditioner isn't cooling well, several factors could be the cause. First, check if the air filter is dirty and clean it if necessary. Make sure that the air conditioner's intake grille or outlet port isn't blocked. Ensure that you've correctly adjusted the thermostat settings. Also, check for open windows or doors, and close them. If it's during cooling operation and sunlight is entering the room, close the curtains. Consider if there are heat-generating appliances or too many people in the room. Finally, check if the unit is set to SUPER QUIET operation, as this can reduce cooling performance.
A
Amanda GambleAug 16, 2025
What to do if my Fujitsu Air Conditioner doesn't operate at all?
- B
  Brandon NelsonAug 16, 2025
  If your Fujitsu Air Conditioner isn't operating, start by checking if the power supply plug is properly connected to the outlet. Also, verify whether there has been a power failure. Finally, check if a fuse has blown out or a circuit breaker has been tripped.
R
Robert ValdezAug 20, 2025
Why does my Fujitsu Air Conditioner airflow become weak or stop?
- A
  aterryAug 20, 2025
  There are several reasons why the airflow in your Fujitsu Air Conditioner might weaken 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. During heating operation, the unit will temporarily stop operation (between 7 and 15 minutes) 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. During SUPER QUIET operation, the fan will operate at very low speed. Also, in the monitor AUTO operation, the fan will operate at very low speed.
K
Kevin McintoshAug 25, 2025
Why is water produced from the outdoor unit of my Fujitsu Air Conditioner?
- W
  wolfepatrickAug 25, 2025
  During heating operation, water may be produced from the outdoor unit of your Fujitsu Air Conditioner due to the automatic defrosting operation.

Fujitsu AST12LSACW Specifications

General

Cooling Capacity	3.5 kW
Heating Capacity	4.0 kW
Power Supply	220-240V, 50Hz
Type	Split System
Noise Level (Outdoor)	50 dB

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