Mitsubishi Mini-split systems offer an ideal solution for homeowners seeking versatility in the installation of air conditioning or other HVAC systems within their homes.

While Mitsubishi mini-split units are known for their high efficiency, the presence and behaviour of two green indicator lights can convey either the system's normal functioning or potential malfunctions, depending on whether they remain steady, blink, or flash intermittently.

Why choose a mini-split unit?

Many homeowners prefer mini-split heating and cooling systems over other options due to the exceptional versatility they offer.

Mini-split units necessitate only a compact interior unit mounted on a wall and do not require ductwork or vents. This feature enables homeowners who may not have the option of using traditional central air or window units to still install mini-split systems in their spaces.

In addition to this flexibility, mini-split units can efficiently cool multiple rooms simultaneously, granting homeowners greater control over the temperature in various areas throughout their homes.

Moreover, the often ductless nature of mini-split systems enhances their efficiency and can lead to substantial reductions in installation costs.

2 green lights on Mitsubishi mini-split

Mitsubishi mini-split units have gained a well-deserved reputation for their exceptional effectiveness and durability in the HVAC market.

Furthermore, Mitsubishi manufactures some of the most compact mini-split units available, enhancing the versatility and flexibility of this type of air conditioning system. This means you can easily install them in various spaces such as bedrooms, offices, garage conversions, or guest rooms without the need for extensive ductwork installation.

However, it's important to note that Mitsubishi mini-split units, like any product, are not without their imperfections. Over time, certain errors may arise with these units, and these issues are typically signalled by the appearance of two green LED indicator lights on the front of the indoor unit.

If you happen to observe two green lights on your Mitsubishi mini-split unit, their potential meanings can be summarized as follows:

Here are the meanings associated with different configurations of the indicator lights on your Mitsubishi mini-split unit:

  • Two green lights illuminated steadily (not blinking): Your unit is actively working to reach and maintain your desired temperature.
  • Two green lights continuously blinking: This indicates a potential issue with the positioning of the louvre on the indoor unit, and it may not be correctly aligned.
  • Two green lights blinking intermittently: This configuration can signify various error codes, implying that there might be a malfunction or problem with the unit's operation.

Two green lights on but not blinking

When you observe both green indicator lights on the front of your indoor Mitsubishi mini-split unit illuminated steadily without blinking, it signifies that your mini-split system is operational. However, it's in the process of reaching the temperature you've set as your desired level.

To confirm this, you can use a thermometer like the popular ThermoPro TP50 Digital Meter, available on Amazon, to measure the room's temperature. This thermometer also provides information about humidity levels and other relevant data in your space, helping you determine how close the current room temperature is to the temperature you've set.

Mitsubishi mini-split indoor units come equipped with their own built-in sensors that continuously monitor the room's temperature. When this temperature differs by more than two degrees Fahrenheit from your desired setting, the green indicator lights activate, and the unit adjusts its fan speed to either cool or heat the room back to the temperature you've chosen.

Pros and Cons of 2 green lights on Mitsubishi Mini-split


  • Operational Status Indicator
  • Temperature Adjustment
  • Diagnostic Aid


  • Louvre/Fan Issue
  • Potential Confusion
  • Limited Error Information

Differences Between Mitsubishi Mini Split and Mitsubishi Electric Air Conditioner

Mitsubishi Mini-Split

Mini-split systems consist of two main components—an indoor unit and an outdoor unit. They are connected by refrigerant lines and require a relatively simple installation process. Mini-splits are known for their flexibility and can be installed in various locations within a building.

Mitsubishi Electric Air Conditioner

Traditional air conditioners are typically centralized systems that consist of a single indoor unit connected to a ductwork system. Installation is more complex, involving ductwork design and installation, making them less flexible in terms of placement.

Alternative to mitsubishi mini split


Daikin is a well-known brand in the HVAC industry and offers a wide range of ductless mini-split systems known for their energy efficiency and reliability. They provide various models suitable for both residential and commercial applications.

Two continuous blinking green lights

When you observe both green indicator lights on your Mitsubishi mini-split unit blinking continuously without any noticeable pauses, this indicates that the flaps or louvres of your unit are not correctly positioned.

Mitsubishi mini-split indoor units are designed with removable flaps, allowing for easy removal and cleaning using a soft brush or cloth.

If these flaps are not reattached correctly after cleaning or if they get accidentally moved out of position, the indicator lights will continue to blink without interruption.

The blinking lights will cease once the flaps have been securely clipped back into place on both sides of the indoor unit. You should also hear a clicking sound when the flaps slide into their proper position.

Two blinking green lights

The green indicator lights on your Mitsubishi unit may also blink in distinct patterns to signal particular errors or issues.

In such instances, you should take note of how many times the lights blink during each interval and then refer to your owner's manual to identify the corresponding error code. These error codes are typically model-specific and will help pinpoint the nature of the problem, which could involve airflow or refrigerant issues, among others.

Checking the voltage of your mini split unit

In summary, encountering an error code P1 when attempting to start your Mitsubishi mini-split unit can often be attributed to issues with the power supply. Diagnosing this problem can be somewhat challenging, but it is crucial for proper system function. Here are the key steps to address this concern:

  1. Check Voltage: Ensure that the voltage of your power supply falls within the range of 187 to 253 Volts AC. This can be verified by following the instructions in the helpful video provided.
  2. Wait for Capacitor Discharge: After checking the voltage, allow the capacitors to discharge by waiting for approximately 5 minutes.
  3. Surge Protection: Consider installing a surge protector to safeguard your mini-split system from voltage fluctuations, as voltage that is either too high or too low can lead to problems.
  4. Power Source: If your mini-split unit fails to power up, investigate the power source to the unit. Verify the functionality of other appliances to rule out power outages or blown fuses.
  5. Electrical Circuit Compatibility: Ensure that the electrical circuit matches the requirements of your mini-split model, whether it necessitates a 220V or 110V plug.
  6. Precaution: Be cautious about using the appropriate wiring and following safety measures when working with electrical components to prevent potential damage and hazards.


In conclusion, the presence and behaviour of the two green indicator lights on your Mitsubishi mini-split unit serve as valuable signals of its status and performance. These lights can convey important information, such as the unit's active operation as it works to reach your desired temperature, potential issues with the louvres or flaps if they are continuously blinking, or specific error codes if they blink in various patterns.

Understanding the meaning of these indicator lights can help you troubleshoot and maintain your mini-split system effectively, ensuring that it continues to provide efficient and reliable heating and cooling for your space.


My name is Wisdom Bassey, I'm a blog content writer and graphic designer who provides support and services for brands and different companies. I'm young and versatile, A tech enthusiast. I carry out deep research on every topic I choose to write about. You can reach me through my social media handles, I'm always available and ready to connect.

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