Mitsubishi Mr Slim Has A Blinking Green Light – Why? What To Do?

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If your Mitsubishi Mr. Slim has a blinking green light, you may be wondering about the cause of the problem and how to fix it. Luckily, we have done some research for you, and here is what we found.

Dirty air filters, low refrigerant, a defective outdoor unit, electrical issues, or excessive voltage are all possible causes of the blinking green light on your Mitsubishi Mr. Slim. Here's what you can do to tackle the problem:

  • Consult the user's manual
  • Check for electrical issues
  • Clean the air filter
  • Check the refrigerant level
  • Call a professional

If you notice that your Mitsubishi Mr. Slim has a blinking green light, solve the issue as soon as possible. Keep reading to get detailed information on how to handle Mitsubishi Mr. Slim with a blinking green light.

Mitsubishi electric Mr.slim - air conditioning compressor were installed at outside the white house.

Why Does My Mitsubishi Mr Slim Has A Blinking Green Light?

Mitsubishi MSZ-HJ25VA air conditioning is installed on a white wall in the apartment. - Mitsubishi Mr Slim Has A Blinking Green Light - Why? What To Do?


The following are common reasons why your Mitsubishi Mr. Slim might have a blinking green light:

Dirty Air Filter

Without regular maintenance, dust will build up on your system and the air filter. This will make the air smell musty. The flashing light can mean the air filter needs to be cleaned. In addition to that, the air filter in your Mitsubishi Mr. Slim may not be installed properly.

If the filter is clogged with dirt, then your air conditioning unit will have a difficult time producing clean air, and it also won't be able to cool the air as effectively. This could cause the blinking green light to come on.

Click here to view this air filter on Amazon

Low Refrigerant

Refrigerant gas is crucial for air conditioners as it ensures proper operation. Low refrigerant may damage the compressor unit. This can be indicated by a hissing sound and a blinking green indicator light.

Defective Outdoor Unit

Problems with the outdoor unit can be caused by anything from obstructed vents to malfunctioning condensers and pressure switches.

Neglecting your outdoor area could be another cause of the blinking light on your Mitsubishi Mr. Slim. Plants of all kinds, including shrubs, have the potential to restrict the airflow needed for the outdoor condenser unit to function properly.

If the condenser coil is covered with dirt or leaves, the normal operation of the unit is hindered, and the unit has to work much harder to accomplish any cooling, which can lead to the failure of the system and the blinking light.

Electrical Issues

Electrical issues can mean there is an irregularity in the loading or power connection and the circuit board or electrical wiring may be having some difficulties.

Active Mode Settings

Most Mitsubishi Mr. Slim models have various mode settings installed in each indoor unit. If a user accidentally selects more than one setting, the indicator light located in the primary control panel will start flashing green. This occurs because the system may not understand the distinct mode settings.

Excess Voltage 

While modern power supplies are generally quite reliable due to technological advancement and improved design preferences, overvoltage can still occur due to a manufacturing error or a faulty main switching transistor.

When your Mitsubishi Mr. Slim senses an overvoltage problem, the air conditioner will automatically switch into a fail-safe mode to protect the unit, as well as your home, from any potential electrical catastrophes.

When this occurs, the light will flash green to alert you that there is a problem with your unit before it begins to shut down.

What To Do If Mitsubishi Mr Slim Has A Blinking Green Light?

Air conditioning vent with green light and on off button

A Mitsubishi Mr. Slim air conditioner may have a blinking green light for several reasons; the good news is that most of these issues are simple to resolve.

The following are things to do if your air conditioner has a blinking green light. There are also some recommended practices to ensure that your system works properly.

Consult The User's Manual

When troubleshooting air conditioning, nearly all models of the Mitsubishi Mr. Slim air conditioner are pre-set to have the blinking light to indicate the presence of a potential problem.

First, check the manual for the brand of air conditioner you have and look for the error codes that might be relevant to your issue. Error codes contain crucial information that might assist you in determining the underlying cause of the issue.

You should be aware that the error codes vary depending on the brand and the model, so you should consult the manual.

Check For Electrical Issues

The blinking green lights can be triggered whenever there is a sudden draw or an abnormal strain on the power supply.

Insulation and continuity tests are required to correctly diagnose the issue and find a solution. These tests require a qualified technician. If the power cord is defective, it is strongly suggested that the problematic component be replaced as soon as possible. 

Also, you can prevent your air conditioner and other electrical appliances from being damaged by an overflow of power. You can do this by installing an aircon socket in your home.

Clean The Air Filter

To ensure that your Mitsubishi Mr. Slim continues to function without any problem, it is important to do maintenance on it regularly. If you perform routine maintenance on your Mitsubishi air conditioner, such as cleaning the filter, you can save money and efficiently maintain a comfortable environment.

Check The Refrigerant Level

Consider checking the level of your refrigerant if your system has a blinking green light. If it does, you can refill it. If the lack of refrigerant is due to leakage, fix it as soon as possible.

Call A Professional

If you've tried all of the above solutions and the blinking green light still doesn't stop, call a professional to help diagnose and fix the problem.

Why Does My Mitsubishi Mr Slim Light Blink 3 Times?

Closeup of an older Mitsubishi Electric Mr Slim outdoor condenser unit.

If the light on your Mitsubishi Mr. Slim blinks three times, this indicates an issue with the indoor fan motor.

Your next move should be to get in touch with an experienced air-conditioning technician and have them fix the problem for you. Do not attempt to solve the problem alone as you may damage other parts.

Why Does My Mitsubishi Mr Slim Have A Blinking Red Light?

If the red light on your Mitsubishi Mr. Slim is blinking, this indicates a problem with your air conditioning system. This flashing light is typically an indication of a serious issue that requires immediate attention. The following can cause the red light to start flashing:

  • Tripped circuit breaker
  • Turned off outdoor unit
  • Dirt in the AC

Why Does My Mitsubishi Mr Slim Has A Blinking Orange Light?

The blinking orange light indicates that the system is overdue for maintenance and should be cleaned. In this case, all you need to do is make sure the filters are checked and cleaned. If a serious cleaning is required, you should contact a qualified professional for help.

Also, the quantities of refrigerant in your air conditioner may be low. Each unit must have a certain amount of refrigerant, and they all come equipped with a meter to determine how much is present in the system.

The blinking of the orange light may indicate that the amount of refrigerant in the system has fallen below the recommended level.

How Do I Reset The Blinking Light On My Mitsubishi Mr Slim?

Controlled air conditioning Turn off air conditioning remote. Energy saving concept.

 To reset the blinking light on your system, you must turn it off and leave it off for at least 20 seconds before turning it back on. After doing this, your Mitsubishi Mr. Slim unit can restart and reset itself, which will fix the blinking light problem.

To Wrap Up

A Mitsubishi Mr. Slim may display a blinking green light due to a dirty air filter, low refrigerant, defective outdoor unit, electrical issue, and excessive voltage. To fix this problem, all you have to do is consult the user's manual, check for electrical issues, clean the air filter, and check the refrigerant level. Don't hesitate to call a professional if you cannot deal with the issue alone.

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