Fujitsu air conditioners are renowned for their reliability and efficiency in keeping indoor spaces comfortable. However, like any complex machinery, they may encounter issues from time to time.

Understanding Fujitsu aircon fault codes is crucial for diagnosing and troubleshooting problems effectively.

In this comprehensive guide, we will delve into the common fault codes encountered with Fujitsu air conditioners and equip you with the knowledge to perform basic troubleshooting and maintenance tasks.

Understanding Fujitsu Aircon Fault Codes

Fujitsu aircon fault codes are alphanumeric indicators that appear on the unit’s display or controller, signalling specific problems within the system.

These codes provide valuable information to both users and technicians, allowing for quick identification of issues and facilitating prompt resolution.

Common Fujitsu Aircon Fault Codes

1. A0

This code typically indicates a communication error between the indoor and outdoor units. It could be due to faulty wiring, a malfunctioning control board, or signal interference. Checking the wiring connections and resetting the unit may resolve this issue.

If the problem persists, professional assistance may be required to diagnose and repair the underlying cause.

2. A1

An A1 fault code signifies a malfunction in the indoor unit’s PCB (Printed Circuit Board) or power module. This could result from electrical issues, component failure, or overheating. Resetting the unit and inspecting for any visible signs of damage or loose connections may help resolve the problem.

3. A5

The A5 fault code indicates an abnormal operation of the outdoor unit’s fan motor. This could be due to mechanical issues, such as a blocked or damaged fan, or electrical problems, like a faulty motor or capacitor. Cleaning the outdoor unit and checking for obstructions may alleviate the issue.

However, if the fan motor requires replacement or repair, professional intervention is necessary.

4. A6

An A6 fault code points to an abnormality in the outdoor unit’s compressor operation. This may be caused by issues such as low refrigerant levels, compressor overload, or electrical faults.

Checking refrigerant levels, inspecting electrical connections, and ensuring proper ventilation around the outdoor unit can help mitigate this problem. If the fault persists, seeking assistance from a qualified technician is advisable.

5. A9

The A9 fault code indicates a problem with the indoor unit’s fan motor. This could be due to a faulty motor, obstructed airflow, or issues with the fan blade. Cleaning the indoor unit, checking for blockages, and inspecting the fan motor for any signs of damage may resolve this issue.

Basic Troubleshooting and Maintenance Tips

In addition to understanding Fujitsu aircon fault codes, regular maintenance and proper usage can help prevent issues and prolong the lifespan of your air conditioning system. Here are some basic troubleshooting and aircon maintenance tips:

 1.    Check the Air Filter

The air filter plays a crucial role in maintaining good air quality and efficient airflow within your Fujitsu air conditioner.

Over time, dust, dirt, and debris can accumulate on the filter, obstructing airflow and reducing the unit’s efficiency. To ensure optimal performance, it is essential to regularly check, clean, or replace the air filter as needed.

Start by locating the air filter. Then, remove the filter and inspect it for any visible dirt or blockages. If the filter appears dirty or clogged, gently clean it with a vacuum cleaner or wash it with mild soap and water. Allow the filter to dry completely before reinstalling it.

2.    Inspect the Outdoor Unit

The outdoor unit of your Fujitsu air conditioner is exposed to various environmental elements, including dust, debris, leaves, and even pests. Regular inspection and maintenance of the outdoor unit are essential to ensure proper airflow and prevent potential issues.

3.    Inspect the Indoor Unit

The indoor unit of your Fujitsu air conditioner also requires regular inspection and maintenance to ensure optimal performance and efficiency. Start by visually inspecting the indoor unit for any visible signs of dirt, dust, or debris accumulation.

Pay close attention to any vents or openings, as blockages can hinder airflow and reduce cooling efficiency. Additionally, check the condensate drain line for any signs of clogging or blockages.

4.    Inspect the Remote Control and Settings

Sometimes, air conditioning issues can be attributed to incorrect settings or programming on the remote control. Ensure that the remote control is functioning correctly and that the settings are adjusted according to your preferences.

If you are experiencing issues with the remote control, such as unresponsiveness or erratic behaviour, try replacing the batteries or resetting the remote control to factory settings.

5.    Schedule Regular Professional Servicing

While basic maintenance tasks can help keep your Fujitsu air conditioner in good working condition, scheduling regular professional servicing is essential for detecting and addressing any underlying issues before they escalate.

A qualified HVAC technician can perform a comprehensive inspection of your air conditioning system, including checking refrigerant levels, inspecting electrical connections, and testing the overall performance and efficiency of the unit.


Decoding Fujitsu aircon fault codes is essential for effectively troubleshooting and resolving issues with your air conditioning system. Consult professional technicians for complex issues or repairs beyond your expertise and prioritise regular aircon servicing to maintain the longevity of your air conditioning system.

At JP Air Conditioning, we have a team of certified and experienced technicians who possess in-depth knowledge of Fujitsu air conditioners and are equipped to handle any issue, from deciphering fault codes and performing basic troubleshooting to complex repairs and maintenance.

We offer:

  • Expert troubleshooting and fault code diagnosis: Our technicians can accurately diagnose the cause of any issue using their expertise and advanced tools.
  • Prompt and reliable repairs: We use genuine parts and employ best practices to ensure your air conditioner is repaired quickly and efficiently.
  • Regular maintenance and servicing: We offer preventive maintenance plans to ensure your air conditioner operates at peak performance and longevity.

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