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Fujitsu Air Conditioning Troubleshooting & Repairs: The Ultimate Guide

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Is your Fujitsu air conditioning system not working, smelling, leaking, or won’t start? These are all signs that your Fujitsu AC unit 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 at the heart of your home. 

Eventually, your Fujitsu air conditioner may break down and needs repairs. Unfortunately, the moment your AC fails is usually when you need it most, which is why you should have a trusted local Fujitsu air conditioning service and repair expert on speed dial. 

The good news is not every problem and malfunction in your AC unit leads to total havoc. Most of these problems are easy to fix and won’t dent your bank account. Fujitsu air conditioning repair services like Alliance Climate Control are reliable, efficient, and can come straight to your business or home to repair your unit.

There are a range of problems that can occur with a Fujitsu split system or central air conditioning system. You may not be able to carry out all Fujitsu air conditioning repairs yourself, but you can start by following this handy troubleshooting manual.  

In this Fujitsu troubleshooting guide you’ll learn:

Read on to get started on troubleshooting 11 most common Fujitsu air conditioner problems.


Why do Fujitsu Air Conditioners Break Down?

Most Fujitsu AC problems arise due to the lack of maintenance, or poor quality of service and installation. Both ducted and split system inverter Fujitsu air conditioners can also develop problems towards the end of their lifespan. 

As with any equipment, prevention and regular care are essential to ensure your Fujitsu air conditioner maintains its top-notch performance. Fujitsu air conditioning and HVAC units also do not last forever – for most of these units, their average lifespan is about 12 years. That means that during their lifetime, they are bound to show wear and tear. 

Poor installation and dodgy servicing or repairs is one of the reasons that a high-quality Fujitsu inverter air con unit can develop a fault. That’s why choosing an air conditioning company experienced with Fujitsu split and ducted units is essential.  

Looking to get the most out of your Fujitsu air conditioner? You’ll need regular  system maintenance, as well as quality repairs when necessary. 

If your Fujitsu unit has a problem, you’ll want to diagnose the problem and figure out how to fix it. The best way to do this is to call an experienced Fujitsu air conditioning professional. However, there are also plenty of minor air con problems you may be able to resolve yourself. 

Keep reading to learn how to troubleshoot your Fujitsu AC unit, whether you have split system, multi split or ducted air conditioning system. 

Fujitsu Air Conditioning Troubleshooting Manual

Here are the causes of common Fujitsu air conditioning problems:

Fujitsu Air Conditioner Not Turning On

If your Fujitsu air conditioner isn’t starting, the possible culprit may be that the thermostat is not set correctly or the power is not reaching the AC unit, typically due to poor installation. Other reasons could include a tripped circuit breaker, a blown fuse, an unplugged condenser unit, a clogged air filter or drain line, a failing motor, or a refrigerant leak.

As such, the proper way of troubleshooting this is by identifying the primary cause. Ensure that the thermostat has working batteries or is installed correctly, the fuse has not been blown, and there is no clogging on the drain line and air filter, among others. If you have ensured that the cause isn’t any of those mentioned above, it might be time to call a technician to check the motor.

Fujitsu Air Conditioner Not Cooling

Fujitsu AC runs but does not cool – May be caused by a dirty or blocked condenser or the thermostat is not properly set; this mostly happens in split systems. If your Fujitsu is not blowing cold air, you might have to check the 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, subject to the frequency of use.

Fujitsu Air Conditioner Not Blowing Air

If the Fujitsu AC unit is turned on, but no air has been blowing out of the vents, the likely culprit is the fan, capacitor, or compressor. Go outside and check the fan. If it isn’t working, you should still hear a humming sound from the compressor. 

If no sound can be heard, then it isn’t the fan but the compressor that has a problem. On the other hand, 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 to a bad fan motor.

Fujitsu Air Conditioner Leaks or Drips Water 

If your air conditioner leaks or drips water, it is probably due to the disconnection of a tube or a water blockage in the unit. 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. 

Remember that there is an evaporator coil inside your AC unit. This causes condensation and produces moisture. This moisture then drips down to a drain pan and into a condensate drain line outside the room.

If the condensate drain line is clogged with dirt or debris, you must unclog it with a wet/dry vac, or have a professional bring a special vacuum to remove the blockage. The problem may also be caused by a damaged or rusty drain pan, a broken condensate pump, or low refrigerant levels. For these cases, replacement of the parts and/or refrigerant will be required.


Fujitsu Air Conditioner Won’t Turn Off

If your Fujitsu air conditioner doesn’t turn off, it may be caused by a blocked or dirty condenser unit or a dirty evaporator, as well as sensor problems. Many malfunctioning parts can cause a continually running air conditioner that refuses to shut off. 

Among these are clogged air filters, frozen evaporator coils, faulty electrical relay switches, or a bad thermostat. It is important to identify which among 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.

Fujitsu Air Conditioner is Noisy

The type of sound the Fujitsu AC unit makes will hint at which component is faulty. Screeching sounds are caused by fan motor issues. Rattling noises may be due to broken motors, misaligned fans, loose panels, or debris. 

A broken compressor motor inside the condenser system, humming noises may be caused by a defective contactor relay switch, buzzing sounds may indicate unbalanced/loose fan blades. Rattling noises may be caused by debris such as dirt, leaves, or pieces of wood.

A malfunctioning thermostat in a Fujitsu air con unit often causes continuous clicking noises, hissing noises, signal leaks in your air duct system, a faulty expansion valve, or an incompatible air filter. Lastly, bubbling noises are caused by blockages, cracks, or holes within the drainage pipe.

These problems require different solutions, whether a repair or an outright replacement. However, some of these may only be repaired by a professional Fujitsu air conditioning technician.

Fujitsu Air Conditioner Cycles On and Off

If your Fujitsu air con unit cycles on and off, this is commonly 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 with repeated cycling, resulting in a higher energy bill. This can be caused by an AC unit that is too large for the room it is in, a refrigerant leak, a compressor failure, frozen evaporator coils, poor thermostat placement, dirty air filters or condenser coils, and electrical problems, among others. While some of these can be fixed with a little DIY, replacing parts, and repairing electrical circuitry are best left to the experts.

Incorrect placement of the AC can also wreak havoc on your comfort. It may also be too close to a hot oven or other sources of heat. This means your air conditioning unit may be in the wrong location and you’ll need a professional to move or replace it. 

Fujitsu Air Conditioner Refrigerant Leaks

What causes Fujitsu air conditioner refrigerant leaks? Poor installation of a central air conditioner can lead to leaky pipework, reducing performance and, in some cases, causing complete failure. This can also occur in Fujitsu split system units. 

Refrigerant leaks are almost always caused by improper installation of the AC unit and its internal components or a crack/hole inside the unit. The exact repair process will depend on the cause of the leak as well as its severity. However, patching the crack coil (if the hole is not too large) and replacing the coil are the most straightforward ways of stopping the leak.

Fujitsu Air Conditioner Heat Mode Not Working

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 heat mode, then you might not have placed it on the proper settings to allow for the heat mode function to operate. 

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

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, you may want to contact your local professional.

Fujitsu Air Conditioner Remote Control Not Working

Arguably the most common and overlooked reason for this is dead or weak batteries inside the Fujitsu AC remote. 

First, switch the placement of the batteries, just like you would on a regular television remote. If swapping the battery placement does not work, try replacing the batteries with a new pair. If that still does not work, your AC remote may have a problem. It may not be practical to send the remote for repairs, so consider replacing it outright from Fujitsu.

Fujitsu Air Conditioner Swing Not Working

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

This means a refusal to swing suggests 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 assistance and expertise of a technician.


How to Reset Fujitsu Air Conditioner

You will need your Fujitsu air conditioner’s remote control to reset the unit. Look for the small button at the bottom that says ‘RESET’ using a small and thin object to tap it. Do this carefully as you risk damaging the button if you apply too much force or use an object that is too sharp.

You can also reset your Fujitsu air conditioner’s Filter Lamp. The indoor units of Fujitsu AC have a built-in filtered 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?

Whenever your Fujitsu AC unit performs an emergency stop, the reason for it will always be stated through an error code. A blinking light typically indicates that there is currently something wrong with your Fujitsu air conditioner. 

Fujitsu air conditioners have three lights on the indoor unit – Operation, Timer, and Economy light. The economy light will continuously blink when an error is detected. The number of flashes for the Operation LED and the Timer LED will also indicate the error code detected.

To read Fujitsu air conditioning error codes, you’ll need to know that the Operation LED is number 1 (first digit), while the Timer LED is number 2 (second digit). For instance, 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 for the most common Fujitsu indoor unit error codes in the table below:

Type of Error Codes



Serial Communication Error between Indoor/ Outdoor Units


Remote Controller Communication Error

External Communication Error


Indoor Unit Capacity Abnormal


Indoor Unit Address Setting Error


Connection Unit Number Error in Wired Remote Controller System


Indoor Unit Main PCB Error

Indoor Unit Manual Auto Switch Error


Indoor Unit Communication Circuit (Wired Remote Controller) Error

Indoor Unit Room Temperature Thermistor Error


Indoor Unit Heat Exchange Temperature Thermistor Error

Indoor Unit Fan Motor 1 Error


Indoor Unit Water Drain Abnormal

Indoor Unit Damper Error


Indoor Unit Intake Grille Position Error

You can find the meaning for the most common Fujitsu outdoor unit error codes in the table below:

Type of Error Codes



Outdoor Unit Main PCB Error


Outdoor Unit Active Filter/ PFC Circuit Error


Outdoor Unit IPM Error


Outdoor Unit Discharge Temperature Thermistor Error


Outdoor Unit Compressor Temperature Thermistor Error


Outdoor Unit Heat Exchange Temperature Thermistor Error


Outside Air Temperature Thermistor Error


Outside Unit Operating Valve Thermistor Error


Outdoor Unit Heat Sink Temperature Thermistor Error


Outdoor Unit Pressure Sensor Error


Outdoor Unit Trip Detection


Outdoor Unit Compressor Motor Control Error


Outdoor Unit Fan Motor 1 Error


Outdoor Unit 4-Way Valve Error


Outdoor Unit Discharge Temperature 1 Error


Outdoor Unit Compressor Temperature Error


How to turn on Fujitsu air conditioner without remote

There may be instances where you cannot turn on your Fujitsu air conditioner using a remote. 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:

  • Begin by ensuring that the AC unit is powered on from its primary source, and check the circuit breaker to ensure there is power.
  • Next is to open the intake grille. Since the intake grilles differ between models of Fujitsu AC units, you will have to examine it carefully since some panels can be difficult to open. Some come off entirely, and some slide outwards. But the point here is to access the filters inside by removing the grille. 
  • 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

If you have inquiries regarding your Fujitsu air conditioner, you may first contact the supplier or installer where you purchased your unit. If you have questions that they are unable to answer, then you may send an email to Fujitsu Australia at 

For tech support-specific inquiries/concerns, you may reach Fujitsu Australia customer support at 1300 882 201 or at


Need Fujitsu Air Conditioner Repairs?

If facing any of the above problems, the easiest and most effective solution is to contact an experienced Fujitsu air conditioning repair service, like us at Alliance Climate Control. 

Trying to do the repairs yourself or prolonging the situation might lead to more costly repairs in the long run and the chaos of having a faulty air conditioning system on hot summer days.

Most of the air conditioning problems listed above can easily be reversed and fixed during maintenance visits. Call a reputable Fujitsu servicing and maintenance professional immediately if you haven’t had your Fujitsu unit checked out in a while, and prevent Fujitsu air conditioner breakdowns before they happen. 

Related Questions

What is the Warranty on a Fujitsu Air Conditioner? 

Fujitsu General Australia gives all domestic air conditioners sold in Australia a 5-year warranty (full parts and labour). For more information on Fujitsu air conditioner warranty terms and conditions, see the Fujitsu Warranty Card

How Often Should I Get My Fujitsu Air Conditioner Serviced? 

Fujitsu air conditioners are best 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 would be just before the change of season every year.

Are Fujitsu Air Conditioners Good?

Fujitsu remains to be 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 a very long time 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, and how frequently it is used. In cases where the 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. Aside from these, ensuring that the 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.