Fujitsu Air Conditioner Troubleshooting (2026 Guide)

Have you noticed a strange smell from your Fujitsu air conditioner? Or maybe it’s leaking or won’t turn on? If any of these are the case, your Fujitsu AC may need repairs. 

Fujitsu is a trusted and efficient international air conditioning brand that is known in Australia for being reliable. Fujitsu’s outstanding high-quality inverter split system and ducted air conditioning systems ensure you enjoy a cool reprieve from hot, dry weather conditions in your home. 

But like any piece of equipment, your Fujitsu air con may break, require a service, or need cleaning. Luckily, not every malfunction will lead to a complete system breakdown and can be easily fixed. This guide will explain why your Fujitsu AC may break down, help you identify key problems, and when you need an expert’s help. 

You may not be able to fix all the problems yourself, but that’s where Alliance Climate Control can help. When your Fujitsu needs repairs, cleaning, or maintenance, our professional climate control technicians provide reliable and efficient services straight to your home or business — Sydney-wide! 

Key Takeaways 

• The leading causes of AC breakdowns are a lack of maintenance, infrequent cleaning, and poor installation.
• To keep your Fujitsu air conditioner working for the long term, clean and maintain the system at least once every 12 months.  
• If you notice leaks, strange noises, or have trouble turning your Fujitsu AC off, these may be signs your unit needs to be cleaned or repaired.  
• While some cleaning and maintenance can be done by you, major repairs and replacements need to be carried out by professionals.  

Why do Fujitsu Air Conditioners Break Down?

Most Fujitsu air conditioners break down due to a lack of maintenance, infrequent cleaning and poor installation or repairs. Both ducted and split system Fujitsu ACs can also develop problems towards the end of their lifespan. This lifespan averages about 12 years, but to keep your quality Fujitsu air conditioner working properly, there are several steps you can take. 

1. Have your Fujitsu AC unit installed professionally 
2. Book your AC to be cleaned at least once a year 
3. Have your Fujitsu AC serviced by qualified technicians
4. Know the signs of a unit issue and troubleshoot 
5. Call a professional technician when repairs are needed  

If you do notice a problem with your system, call an experienced Fujitsu air conditioning professional from Alliance. We handle the entire process from diagnosis to the resolution of the issue.

Fujitsu Air Conditioning Troubleshooting Manual

While Alliance Climate Control can handle the big-ticket repairs, there are also ways you can fix your Fujitsu system yourself. Below are some common issues and the troubleshooting techniques you can use before you call out the big guns (that’s us). 

AC Unit Not Turning On 

If your Fujitsu air conditioner isn’t turning on, the possible culprit may be that the thermostat is set incorrectly or the power is not reaching the AC unit. Typically, this is due to poor installation. Other reasons could include: 

• Tripped circuit breaker
• Blown fuse
• Unplugged condenser unit
• Clogged air filter or drain line
• Failing motor
• Refrigerant leak.

The proper way of troubleshooting this issue is by identifying the primary cause. When inspecting your AC, check:

• The thermostat has working batteries and is installed correctly
• The fuse has not blown 
• There is no clogging on the drain line or air filter 

If you have ensured that the cause isn’t any of those mentioned above, it might be time to call an Alliance technician to check the motor.

AC Unit Not Turning Off 

A Fujitsu air conditioner not turning off may be caused by: 

• Blocked or dirty condenser unit 
• Dirty evaporator
• Clogged air filters 
• Frozen evaporator coils 
• Faulty electrical relay switches 
• Bad thermostat
• Sensor problems 

Many malfunctioning parts can cause an air conditioner to run continuously and refuse to shut off. It is important to identify which of these are causing the problem and determine the troubleshooting method from there. 

If it is due to faulty electrical relay switches, then the best way forward is to call a professional Fujitsu AC technician to conduct the repairs.

Cooling Issues 

A Fujitsu AC not cooling but still running may be caused by a dirty or blocked condenser or an improperly set thermostat. This is most common in split systems, and it’s best to check your AC unit’s air filters.   

Dirty filters are a common cause of cooling problems for Fujitsu air conditioners. The accumulation of dirt, debris, hair, and other indoor pollutants makes it very difficult for cold air to pass through. It is recommended that the air filters be cleaned at least every 400 hours of operation, depending on the frequency of use.

Heat Issues

First, confirm that your Fujitsu air conditioner has a heat mode, as some assume this feature exists on every AC unit when not all AC units come with it. If there is a heat mode, then you might not have set it to the proper settings to allow the heat mode function to operate. 

In some cases, dirty filters, circuit breaker problems, or obstructed airflow are the reasons for heating issues.

If the settings are incorrect, set the AC unit to ‘HEAT’ and not ‘Auto’. Next, look for the heating function and set the temperature higher than for cooling. Lastly, instead of leaving the fan speed adjustment on auto, set it accordingly so your AC unit will work. 

For other more complicated causes, speak to a local professional at Alliance Climate Control.

Fan Issues  

If your Fujitsu AC unit is turned on, but no air is being blown out of the vents, the likely culprits could be the:

• Fan
• Capacitor
• Compressor

Go outside and check the fan. If it isn’t working, you should still hear a humming sound from the compressor. If there is no sound, the compressor is the problem, not the fan.

If you have identified the fan as the problem, try to “kick-start” the fan using a long stick of any non-conductive material (such as wood) right through the fan grate. If the fan starts to move, then it is the capacitor that is problematic.

If the compressor is humming and kick-starting the fan does not work, then it may be a broken fan motor. This problem usually occurs in poorly maintained units or in a very dusty environment. Replacement is the only solution for a bad fan motor.

Leaks & Dripping Water

Leaks and dripping water from an air conditioner are usually due to a disconnected tube or water blockage.  

If your Fujitsu air conditioner leaks water from the inside unit, it may be caused by a clogged condensate drain line. This is most common in Fujitsu split systems. 

An evaporator inside your AC unit causes condensation and produces moisture. This moisture then drips down to a drain pan that flows into a condensate drain line. 

If the drain line is clogged with dirt or debris, use a wet/dry vac to unclog it or call a professional to remove the blockage with a special vacuum.  

Leaks may also be due to:  

• Damaged or rusty drain pan
• Broken condensate pump
• Low refrigerant levels

For these cases, replacement of the parts and/or refrigerant will be required.

Unusual Noises & Sounds 

The type of sound the Fujitsu AC unit makes will hint at which component is faulty. Screeching sounds are caused by fan motor issues.

These problems require different solutions, whether a repair or an outright replacement. To remedy these issues, call a professional Fujitsu air conditioning technician from Alliance Climate Control. 

Short Cycling 

If your Fujitsu air con unit cycles on and off, this is referred to as short cycling. It occurs when the AC unit’s cooling cycle prematurely ends, only to turn on again after a short while. This is caused by broken/failing parts, or other electrical and mechanical reasons. 

This damages the AC unit by subjecting it to unnecessary wear and tear, resulting in a higher energy bill. This can be caused by: 

• An AC unit that is too large for the room
• Refrigerant leak
• Compressor failure
• Frozen evaporator coils
• Poor thermostat placement
• Dirty air filters or condenser coils
• Electrical problems

While some of these can be fixed with a little DIY, experts should handle replacing parts and repairs. 

Incorrect placement of the AC can also be detrimental to your system, especially if it’s placed near heavy heat load appliances like ovens. To move or replace your unit, call a professional at Alliance. 

Refrigerant Leaks 

Refrigerant leaks in Fujitsu air conditioners are often caused by poor installation of a central air conditioner and can lead to leaky pipework. This reduces performance and, in some cases, causes complete failure. Internal components are put under stress, leading to cracks/holes inside the unit. 

The exact repair process will depend on the cause of the leak and its severity. However, patching the crack in the coil (if the hole is not too large) and replacing the coil are the most straightforward ways of stopping the leak. Both of these steps require professionals. 

Remote Control Issues 

The most common reason for faulty air conditioner remotes is dead or weak batteries. To remedy this, replace your batteries. If your remote still won’t turn on, you may have to replace the remote itself.  

Motion & Vent Issues

If the vents of your Fujitsu air conditioner refuse to swing, you are most likely looking at an electrical problem inside the unit. The swing motion of air conditioners is controlled by separate swing motors. 

Stuck vents usually indicate the printed circuit board (PCB) is unable to send current to the motors, or the motors themselves have a problem. Unfortunately, this problem isn’t something that can be reliably solved alone and requires the expertise of a technician. 

How to Reset a Fujitsu Air Conditioner

To reset your Fujitsu air conditioner, follow these steps: 

1. Find your remote control. 
2. Locate a small, recessed button that says ‘RESET.’ This is usually below the rest of the buttons.
3. Use a thin object and tap it while aiming at your AC. It is easy to damage the button if the object is too sharp or you use too much force, so use care. If your remote does not have a dedicated button, hold the ‘ON/OFF’ button for 5 seconds.
4. Wait for the remote’s display to go blank. You may also hear a beep from your unit, and a ‘C’ will appear on the display.
5. Release the ‘RESET’ or ‘ON/OFF’ button, then turn the unit back on.

You can also reset your Fujitsu air conditioner’s Filter Lamp. The indoor units of Fujitsu AC have a built-in filter lamp safety feature which indicates when the filters require some cleaning. The filter lamp may be reset by tapping the filter’s ‘RESET’ key.    

Why is my Fujitsu Air Conditioner Light Blinking?

A blinking light typically indicates that your Fujitsu AC unit has performed an emergency stop. The reason for it will always be stated through an error code. 

Fujitsu air conditioners have three lights on the indoor unit. The number of flashes indicates the error detected: 

• Operation LED: Flashes three times. The error code is 1 (first digit).  
• Timer LED: Flashes two times. The error code is 2 (second digit). 
• Economy LED: Blinks continuously. 

For example, if the Operation LED flashes three times while the Timer LED flashes two times, it may equate to error code 32, which is the Indoor Unit Main PCB Error.

The only caveat is that the AC unit can only display one problem through the light flashes. This means if your Fujitsu AC unit is experiencing more than one problem, it will only show up after the first error code (represented by light flashes) has been resolved.

You can find the meaning of the most common Fujitsu indoor unit error codes in the table below:

How to Turn on a Fujitsu Air Conditioner Without a Remote

There may be instances where you can’t use a remote to turn on your Fujitsu air conditioner. This could be due to a faulty or broken remote or dead batteries. Either way, manually turning the AC unit on is relatively straightforward. 

Follow the steps below to turn on a Fujitsu air conditioner without a remote:

1. Begin by ensuring that the AC unit is powered on from its primary source, and check the circuit breaker to ensure there is power.
2. Next, open the intake grille. The intake grilles differ between models; some come off entirely and some slide outwards. So, ensure you take care when opening the panels. 
3. After opening, you will see the unit’s power button in the upper right corner. Press it to turn on the air conditioner.

The caveat to turning on the AC using this method is that it does not allow you to adjust the temperature settings and, presumably, all other extras/advanced features that you would otherwise be able to set through the remote. 

If your Fujitsu air conditioner still refuses to turn on after this manual method, then your problem isn’t with the remote but with the unit itself.

How to Contact Fujitsu Air Conditioning Tech Support

For inquiries regarding your Fujitsu AC, contact your supplier first or the installer where you purchased your unit. 

If they are unable to answer your questions, you can contact Fujitsu Australia at: enquire@au.fujitsu.com

For tech support or specific inquiries, reach out to Fujitsu Australia customer support on 1300 882 201 or at contact@fujitsugeneral.com.au.   

Need Fujitsu Air Conditioner Repairs?

The best way to keep your Fujitsu AC working through winter winds and summer heat is regular cleaning and maintenance. Entrust yours to Alliance Climate Control. 

Alliance has years of experience installing Fujitsu air conditioners across Sydney. So when your system breaks down or needs a clean, we have the know-how to get your home’s climate back under your control. 

Call Alliance Climate Control today on (02) 8061 5023 or book an appointment online.  

Frequently Asked Questions

What is the Warranty on a Fujitsu Air Conditioner? 

The warranty on a Fujitsu air conditioner in Australia is 5 years (full parts and labour). For more information on Fujitsu air conditioner warranty terms and conditions, see the Fujitsu Warranty Card. 

When you install a Fujitsu AC in your home with Alliance Climate Control, you get a lifetime workmanship warranty and 100% satisfaction guarantee.  

How Often Should I Get My Fujitsu Air Conditioner Serviced? 

Fujitsu air conditioners should be serviced every 12 months on average. However, this could be more frequent depending on how heavy your air conditioner use is, or how much dirt your air conditioner collects from your environment. The best time to get your AC serviced is just before the change of season every year.

Are Fujitsu Air Conditioners Good?

Fujitsu ACs are known for being a reliable air conditioner brand around the world. The company has decades of technical knowledge and experience in the air conditioning industry. Their AC units have been known to last for an average of 12 years with minimal degradation in performance.

How Long Do Fujitsu Air Conditioners Last? 

Fujitsu, much like other reputable air conditioner brands, can last an average of 10-15 years, depending on: 

• How well-maintained it is
• How often it is serviced
• How frequently it is used

In cases where an AC unit is maintained and serviced exceptionally well, it lasts up to 20 years.

How Can I Improve the Life of My Fujitsu Air Conditioner? 

You can increase the lifespan of your Fujitsu air conditioner by keeping it well-maintained and serviced regularly. Ensuring your AC unit’s filters, condenser line, drain pans, and other internal components are clean and in good working condition will positively affect your AC unit’s life.