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Fujitsu AOU18CL - Service Manual

Fujitsu AOU18CL
81 pages
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SPLIT TYPE
ROOM AIR CONDITIONER
WALL MOUNTED
type
Models Indoor unit Outdoor unit
ASU9RLQ
ASU12RLQ
ASU18CL
ASU18RL
AOU9RLQ
AOU12RLQ
AOU18CL
AOU18RL
INVERTER
SERVICE
INSTRUCTION
R410A

Table of Contents

Other manuals for Fujitsu AOU18CL

Questions and Answers

  • P
    patrick60Aug 12, 2025
    Why is my Fujitsu AOU18CL Air Conditioner not cooling properly?
    • D
      david10Aug 12, 2025
      If your Fujitsu Air Conditioner is not cooling well, make sure the air filter is clean. Also, check that the intake grille or outlet port isn't blocked. Verify that you've set the room temperature correctly on the thermostat. Ensure no windows or doors are open, and close curtains if sunlight is entering. Also, consider if there are heating appliances or too many people in the room. Finally, check if the unit is set to SUPER QUIET operation.
  • A
    Andrew GravesAug 16, 2025
    What to do if my Fujitsu AOU18CL Air Conditioner doesn't turn on?
    • C
      Christy PeckAug 16, 2025
      If your Fujitsu Air Conditioner doesn't operate at all, check if the Power Supply Plug is disconnected. See if there has been a power failure. Also, check if a fuse has blown out or a circuit breaker has been tripped. Finally, verify if the timer is operating.
  • S
    Susan DavisAug 19, 2025
    Why is my Fujitsu Air Conditioner not responding to the remote?
    • T
      Tammy FoxAug 19, 2025
      If your Fujitsu Air Conditioner isn't responding to the remote control, check if the batteries are dead. If not, ensure the batteries are loaded properly in the Remote Control Unit.
  • A
    Amy WintersAug 23, 2025
    Why is the airflow weak on my Fujitsu AOU18CL Air Conditioner?
    • J
      Jennifer ReidAug 23, 2025
      If airflow from your Fujitsu Air Conditioner is weak or stops, it might be due to the Dry operation mode or the unit monitoring the room's temperature, where the fan operates at a very low speed. Also, during SUPER QUIET operation or in monitor AUTO operation, the fan speed is reduced significantly.
  • Y
    Yvonne KimAug 27, 2025
    Why doesn't my Fujitsu AOU18CL start immediately?
    • E
      Eric OliverAug 27, 2025
      If your Fujitsu Air Conditioner doesn’t operate immediately after being turned on, the compressor may not operate for about 3 minutes to prevent fuse blowouts. Also, if the Power Supply Plug is disconnected and reconnected, the protection circuit will prevent operation for about 3 minutes.
  • T
    Tracy MurphyAug 31, 2025
    Why is my Fujitsu AOU18CL emitting mist?
    • B
      bruce49Aug 31, 2025
      If you notice a mist or steam coming from your Fujitsu Air Conditioner, especially during Cooling or Dry operation, it's likely due to the sudden cooling of room air. This causes condensation, resulting in a thin mist.
  • E
    emily77Sep 4, 2025
    Why does my Fujitsu Air Conditioner smell?
    • L
      Leonard NewtonSep 4, 2025
      If you notice some smell emitted from your Fujitsu Air Conditioner, it's likely due to room odors like furniture or tobacco smells that have been drawn into the unit.
  • K
    Kyle HatfieldSep 7, 2025
    Why is my Fujitsu AOU18CL Air Conditioner making noise?
    • S
      Sean WoodSep 7, 2025
      If you hear noise from your Fujitsu Air Conditioner, it could be the sound of water flowing in the piping during or immediately after operation. It could also be the sound of coolant flowing, particularly noticeable for about 2 to 3 minutes after starting. A slight squeaking sound might also occur due to minor expansion and contraction of the front cover caused by temperature changes.

Summary

SERVICE INSTRUCTION

1. SPECIFICATIONS

2. DIMENSIONS

3. REFRIGERANT SYSTEM DIAGRAM

4. CIRCUIT DIAGRAM

5. DESCRIPTION OF EACH CONTROL OPERATION

1. COOLING OPERATION

Details compressor frequency control for cooling based on temperature.

2. HEATING OPERATION

Details compressor frequency control for heating based on temperature.

8. COMPRESSOR CONTROL

10. ELECTRONIC EXPANSION VALVE CONTROL

11. TEST OPERATION CONTROL

19. DEFROST OPERATION CONTROL

20. OFF DEFROST OPERATION CONTROL

21. VARIOUS PROTECTIONS

4. COOLING PRESSURE OVERRISE PROTECTION

Stops compressor if outdoor unit pressure exceeds limits.

6. REFRIGERANT CAUTION -R410 A-

1. R410 A TOOLS

Lists necessary tools and equipment for R410A refrigerant.

2. PRECAUTION FOR INSTALLATION

Covers pipe diameter, material, and flare nut requirements for R410A.

3. PRECAUTION FOR SERVICING

Highlights differences and precautions for servicing R410A.

7. TROUBLE SHOOTING

Does not operate at all (Operation Lamp and Timer Lamp do not light up)

Checks power supply, wiring, and connections for no operation.

SELF-DIAGNOSIS FUNCTION

Explains how to read error codes via lamp indicators.

IPM Protection

Troubleshoots issues related to the Intelligent Power Module.

Trouble Shooting of Refrigerant Cycle

Diagnoses common refrigerant cycle faults.

9. REPLACEMENT PARTS

10. INSTALLATION MANUAL

Fujitsu AOU18CL Specifications

General IconGeneral
BrandFujitsu
ModelAOU18CL
CategoryAir Conditioner
LanguageEnglish

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