Common Mitsubishi Air Conditioner Issues and When to Call for Repairs

Apr 28, 2026

From value to performance and efficiency, Mitsubishi air conditioners are held in high regard for good reason.. Within their large network, there are two offshoot companies that supply air conditioning in Australia- Mitsubishi Electric and Mitsubishi Heavy Industries. Absolute Airflow install both brands and trust their workmanship and quality of products.

Although they’re generally reliable and easy to maintain, all air conditioners will have their issues from time to time. This can include models from both the Mitsubishi Electric and Mitsubishi Heavy Industries range. 

In this article, we’ll take a look at what those common issues are and give you advice on how to look for them and possibly fix them. We’ll also let you know when you need to call an Absolute Airflow technician to come out and service or repair your units.

Common Features and Highlights of Mitsubishi Air Conditioners

Mitsubishi is world renowned for building robust units that work well in Australia’s harsh climates. They can withstand the scorching sun and the tropical downpours that occur across Australia. Often, their units feature anti-corrosion coating to help them last longer in our conditions.

The energy efficiency of Mitsubishi units is also well known. Inverter technology and R32 refrigerant are both factors giving high energy star ratings for Mitsubishi air conditioners and helping to reduce running costs and hence, your power bills.

They have whisper-quiet performances and smart technology. You can install a Mitsubishi split system in your bedroom and have it cooling you down while you fall asleep. Then you can have a timer set on your smart phone app, which will send the signal to the unit to shut off an hour after you’ve fallen asleep.

This Wi-Fi technology also allows you to control your home environment from anywhere in the house, or on the run. Set the air conditioner to turn on when you leave work, and your home is cool when you walk in the front door.

Why We Recommend Mitsubishi Models

Absolute Airflow sells and installs Mitsubishi Split Systems, which are popular for individual rooms and large, 2-story homes and office buildings, as you don’t need to feed ducting between the floors. We also stock multi-split systems that you can hook up multiple units to a single outdoor unit. This saves space as well as power.

We also stock and install ducted systems, a whole-home air conditioning system which can give you comfort and efficiency.

Common Issues With Mitsubishi Air Conditioning Units

• > The unit is not cooling or heating. This issue is commonly caused by dirty filters not allowing the full heat or cool through to the home or office, or it could be a clogged outdoor unit, which starves the supply of air into the unit. Or, it could be that you’ve set the unit to the wrong setting, such as FAN rather than COOL.
  SOLUTION – clean the filter regularly and check on the outdoor unit. Sometimes debris can blow into the filter that needs to be brushed away. Washing and cleaning the outdoor unit also works.

• > Water leaks. Water leaks may come from your air conditioner through a blockage in your condensate line or sometimes through improper unit installation.
  SOLUTION – You can check for where the water is leaking, and if it is not too major, a temporary seal may help, but we’d recommend giving our technicians a call to come replace a condensate line. If the issue is much larger and is a result of bad installation, then we may need to do some larger work on your air conditioner.

• > Unusual noises. This issue could mean many different things. A hissing sound could mean high pressure in the pipes somewhere; grinding or screeching noises could mean issues with your fan motor.
  SOLUTION – anything like this would immediately warrant a call to one of our technicians to come out and investigate. We don’t want your Mitsubishi air conditioner exploding due to high pressure, or crashing to a stop thanks to an unaligned fan or a worn out motor.

• > Strange smells. Most commonly, bad odours are due to the building up of mould and mildew in the indoor unit.
  SOLUTION– a good clean with warm soapy water and a sponge should usually take care of the mould and the smell.

• > System not responding. Your display unit or the control on the wall can have warning messages or communication issues (E7/E6), or there could be flashing lights indicating a sensor failure.
  SOLUTION – This is an instance where calling Absolute Airflow is essential. Our technicians can diagnose the problem and repair it quickly and effectively.

Maintenance Tips For You

There are some things you can do to keep your Mitsubishi air conditioning unit running smoothly and out of the hands of a repair person for longer.

• > Clean the air filters every four to six weeks for optimal performances and to keep airborne particles from your house.
• > Clean the outdoor unit of leaves and other debris, or other obstructions that may restrict the airflow into your home. This can prevent overheating and inefficient operations. Also, clean the condenser fins carefully to avoid mould and mildew buildup.
• > Reset the system if it is malfunctioning. The tried and tested- turn it off and back on again method can be remarkably effective in solving some problems. If you can, leave it off for at least 20 minutes, before restarting.
• > Professional service every couple of years just to be sure that it is working perfectly, and no small issues are left to become major problems on the hottest day of the year.

Mitsubishi makes quality products that can heat and cool your home or your office for many years, if they’re maintained and serviced regularly. Don’t let something small, such as a little rattle, grow into an emergency. Call 03 7036 9149 or contact us via email. Absolute Airflow are your Mitsubishi air conditioning maintenance and repair specialists in Melbourne.

Ask us about our Mitsubishi Electric and Mitsubishi Heavy Industries models and get a free quote and heat your home or cool your office, thanks to Absolute Airflow.

FAQ

Q: What Mitsubishi air conditioning brands does Absolute Airflow install?

We install and service both Mitsubishi Electric and Mitsubishi Heavy Industries models. While these are two separate companies, we trust the quality and workmanship of both brands and can help you choose the right one for your needs.

Q: Can you service and repair existing air conditioning systems?

Absolutely. Our team handles repairs and servicing for all types of systems, including specialist servicing for Mitsubishi. Regular servicing helps keep your system running efficiently and extends its lifespan.

Q: Does Absolute Airflow offer a warranty on Mitsubishi installations?

Yes. All our Mitsubishi installations come with a lifetime workmanship warranty, as well as the manufacturer’s warranty on the equipment itself. You can have complete confidence in both the product and the installation.

Q: Do you offer payment options?

Yes, we offer interest-free payment options to make our services accessible for a range of budgets. Ask our team about the options available when you request your quote.

Q: How do I know what size system I need?

The right system size depends on a number of factors, including the size of your home, ceiling height, insulation, and local climate. Our experienced team will assess your property and recommend the most suitable and energy-efficient solution for your needs.