Mitsubishi Electric Air Conditioning – A Guide To Maintenance & Repairs

June 07th, 2024
Air Conditioning Repair

Although Mitsubishi air conditioners are known for being reliable, cost-effective, and efficient, they still require ongoing maintenance and repairs to perform at their best. If you’re one of the thousands of Australians who own a Mitsubishi electric system, we’re here to give you the ultimate guide to maintenance and repairs. 

Whether you need to maintain a split or indoor system unit or want better indoor air quality, this article will be your best guide to air conditioner routine maintenance and repair for many Mitsubishi models. We’ll cover everything from the most common issues to look out for, guidelines for servicing, and when it’s time to organise repairs.

Recommended Maintenance Schedule

What is recommended by heating and cooling experts? Let’s explore the common annual maintenance schedule you should follow.


Clean or replace indoor unit filters. Dirty filters can block airflow, making your system use more energy than it needs to. Per the manufacturer’s guidelines, replace or clean these filters every month for cleaner air circulation.

Inspect the outdoor unit for obstructions and debris. Removing leaves, twigs, grass, or debris will ensure it runs correctly.

Seasonally (Spring and Autumn)

Clean the outdoor unit. Before the hot summer and cold winter, this unit, including the cover, is cleaned, and the coils and fins are gently cleaned to remove dirt.

This will ensure the system lasts longer. The blades and other components of the indoor unit will need cleaning.

Inspect refrigerant lines. If there are signs of leakage, a professional repair is necessary.

How Often Should You Service Your AC?

How often you should invest in regular maintenance depends on your unit’s use, climate, indoor environment, number of occupants in your home, and even your pets.

Your system should be serviced at least once a year, ideally every six months, for high performance and efficiency. Scheduling a seasonal service such as cleaning helps guarantee you get the most out of your system, maximising energy efficiency and safety for your family. 

It doesn’t matter if it’s a brand-new Mitsubishi aircon or an older model, it’s essential to be aware of how to keep them in good working order.

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Mitsubishi Electric Air Conditioners – Issues To Look Out For

What are some common problems with Mitsubishi Electric air conditioners? Let’s have a look at some Mitsubishi models.

MSY-GY90VFD – Split System Indoor Unit

Beyond a non-operational unit, other key signs to look out for include when the horizontal vane doesn’t move, mist is discharged from the air outlet of the indoor unit, it does not cool, the air from the indoor unit smells strange, a crackling sound is heard, the weekly timer doesn’t operate, or the aluminium fin of the edge of the heat exchanger is discoloured.

Split System Filters Maintenance

Mitsubishi Split Systems–such as the MSZ-AP2280–can have issues when air filters become clogged with dust and debris, so they need to be cleaned regularly. 

Primary air filters should be cleaned every 2 weeks, anti-allergy filters must be cleaned every 3 months and replaced every 12 months, and plasma quad filters should be cleaned every 3 months.

MSZ-LN-VG2 Series

Symptoms of problems include the remote controller display not appearing, the room not being cooled or heated efficiently, the indoor unit–which isn’t operating–is warm with a water flowing noise, water is leaking from the outdoor unit, or white smoke is discharged from the outdoor unit.

PEA-M100 Series

This air conditioning unit can have issues such as the fan speed changing without changing these settings, a motor rotation sound, a cracking or creaking sound is heard, water or vapour is omitted from the outdoor unit, or an occasional hissing sound is heard. For more information on troubleshooting, check out the PEA-M100 user manual.

Mitsubishi Electric Air Conditioning Warranties

In terms of warranty for Mitsubishi Electric systems, what can you expect? For the Air Conditioner P Series (Mr Slim), there is a warranty of up to 5 years for parts and labour. 

Air Conditioner M Series (all models) have a warranty of up to 5 years, including parts and labour. The Air Conditioner S Series (all models) also has a 5 year warranty.

The Air Conditioner City Multi (Commercial) has a warranty period of up to 2 years for parts and 1 year for labour. If you’d like more information, contact the Aust Climate team for accurate information for your next purchase!

Mitsubishi AC Maintenance Tips

What are the most common maintenance tips for a Mitsubishi Electric air conditioner?

Outdoor Unit Maintenance

  • > Turn off the power at the main electrical panel to prevent accidents.
  • > Use a soft brush or vacuum to remove debris from the unit’s exterior. This prevents blockages and maintains airflow!
  • > Clean the fins using a garden hose to spray them from the inside out. Avoid using high pressures, as this can bend the fins.
  • > Check for overgrown grass around the unit, and check the base so it is stable and level.

Indoor Unit Maintenance

  • > Turn off the unit before cleaning to prevent dust or debris from being drawn into the system.
  • > Use a vacuum cleaner to remove dust from the filters and enhance air quality.
  • > If the filters are washable, rinse them with soapy water. Let them dry completely before reinserting to prevent mode growth.
  • > Open the unit’s cover and inspect the fan blades. Clean the blades with a damp cloth and check for cracks or damage affecting performance.

Heating Mode Maintenance

  • > Switch to heating mode at the start of the cold season to ensure it’s functioning.
  • > Inspect and clean the heat exchanger as per the manufacturer’s guidelines.
  • > Check thermostat settings. Setting it correctly will maintain your desired temperature.
  • > Listen for unusual noises and noise levels.
  • > Test the heating system. Always check for consistent airflow throughout your spaces.

Signs of Low Refrigerant Levels

A low refrigerant can cause an AC to work harder, raising energy bills and potentially causing your compressor to overheat and fail. With this in mind, what are some clear signs it isn’t working for you?

  • > Ice build-up of refrigerant lines or the evaporator coil.
  • > Increasing energy bills without a change in AC usage can mean your system works twice as hard as needed.
  • > Hissing or bubbling noises suggest a leak, so seek immediate repair and inspection.

Most Common AC Issues

Let’s look at the common problems your air conditioner might be having.

The system isn’t cooling your space

If your Mitsubishi Electric system isn’t cooling properly, it could be due to blocked filters, low refrigerant, or a faulty component! 

Blocked filters are the most common problem for air conditioning systems. When used, they slowly accumulate dust, blocking airflow and cooling efficiency. Once you clean them out, your air conditioner should return to normal. 

Faulty components such as an electric control board, fan, or compressor can reduce your Mitsubishi’s cooling capabilities. Limited airflow can also be caused by a faulty motor damper.

Low refrigerant is caused by air conditioning leakage over time, and a professional can easily replace intricate parts for you.

The air conditioner keeps turning off and on

A faulty timer, compressor, or condenser can be the culprit.

Attempt changing the setting on your timer, but if it persists, a professional will need to replace your time. Never attempt to fix complex problems on your own!

The indoor unit isn’t turning on

Does your Mitsubishi Electric air conditioner refuse to turn on? This could indicate a tripped circuit breaker. Check your metre box for the circuit breaker and see if it turns on. If the trip switches off, switch it back on again.

If the air conditioner continues to trip the circuit breaker, the isolation switch might be a problem if it is stuck or difficult to move.

The air conditioner won’t turn off

A few things can cause your Mitsubishi Electric to not turn off. When the fan limit is set to “on” instead of “auto,” the fan will keep running regardless of thermostat settings. Press the fan button on the control panel until “auto” shows on the screen.

If the temperature is too low, the Mitsubishi air conditioner will not shut off until it reaches a set temperature. This process takes longer if your indoor environment is hot and humid.

Additionally, dirty filters restrict airflow, making it harder for the AC to cool interiors until it reaches the set temperature. Clean filters once every three months.

If in doubt, always contact a professional for accurate advice and AC diagnosis. To learn more, compare Daikin vs. Mitsubishi Electric air conditioning.

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Call Us for Your Air Conditioning Service
Call us now to schedule your air conditioning service and enjoy uninterrupted comfort all year round!

The air conditioner makes odd sounds

Is your air conditioner making odd noises? If you notice clicking, buzzing, grinding, or hissing sounds, shut down your system immediately.

A noisy Mitsubishi Electric can indicate loose components, a faulty compressor, or damaged isolation feet.

Mitsubishi air conditioner swing is not working

If your AC isn’t in swing mode, set it correctly. If it still isn’t working, virtually inspect the swings with a flashlight and check for foreign objects jamming them. 

If you have removed the object with a flat screwdriver but are experiencing issues, a technician will need to resolve the swing motor.
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Mitsubishi AC Controller: Troubleshooting

Does your Mitsubishi controller fail when you need it most? Here are some quick fixes for common issues.

The remote control isn’t turning on. This problem often requires battery replacement. However, if it still doesn’t work, contact the manufacturer for a replacement controller.

The remote controller isn’t working. If the Mitsubishi remote isn’t responding, remove the batteries and put them back in. Alternatively, bring the remote within 10 metres of the AC or reset the unit entirely. 

The Control Board isn’t turning on or showing a blank screen. If replacing the batteries doesn’t work, the Control Board or screen might need repairs.

Manually Resetting a Mitsubishi AC System

In some situations, resetting your Mitsubishi air conditioner or remote control can solve many problems.

  • > Attempt to reset the unit with your remote controller by pressing the reset button at the bottom of the remote’s control panel.
  • > You can also open your home’s breaker board and turn off the switch connected to the AC. Wait 30 seconds, and then flip the switch back on. 
  • > Hold the power button for a few seconds to reset the remote control. The button light will blink once and then turn off! 

If you’re keen to switch from a gas system to an electric Mitsubishi air conditioning reverse cycle or split system, here’s how to replace your gas heater with electric heating and cooling!

Choose Aust Climate For Mitsubishi Air Conditioning in Melbourne

Are you at a loss for maintenance and repair support? Aust Climate System has several great options to suit your home or workspace, from the latest electric split systems to multi-head split systems.

We supply, maintain, and install split systems, multi-head split systems, air conditioning, ducted reverse cycle heating and cooling, and more for your property as trained technicians. With 25 years of industry experience, visit our showroom in Chirnside Park or contact us today for a quote from our on-site consultants.

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