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2 Green Lights On Mitsubishi Mini Split [Troubleshotting Guide]

2 Green Lights On Mitsubishi Mini Split

There’s unanimous agreement that Mitsubishi excels in crafting mini-split air conditioning systems, renowned for their reliability, longevity, cost-effectiveness, and minimal maintenance needs.

These air conditioning systems have advanced intelligence sensors that detect and signal emerging faults promptly. Occasionally, the issue may be signified by two static or blinking green lights, while an error code will be displayed at other times.

In Mitsubishi mini-split systems, two static green lights typically signify that the heat pump is actively working to reach the preselected temperature. Conversely, blinking green lights, often accompanied by an error code, indicate a system fault or issue.

Not all green lights mean there’s a problem with the air conditioning. Sometimes, blinking lights, like when there’s too much electricity (over-voltage), just restart the system, and you don’t have to do anything.

If the heat pump shows that it hasn’t reached the right temperature, don’t worry. But when these indicator lights come with an error code, that’s when you should pay attention because it means there’s a problem that needs fixing.

Moreover, it’s crucial to consider the potential causes of system faults, such as poor airflow, a frozen coil, low refrigerant, a malfunctioning thermistor, electrical issues, or installation problems when there is a code error

2 Green Lights On Mitsubishi Mini Split Quick Troubleshooting Guide

Here is a quick troubleshooting guide that provides insights into interpreting indicator lights on Mitsubishi Mini Split AC and offers corresponding actions for resolving potential issues,

Indicator LightsIssueNecessary Steps
Static 2 Green LightsHeat pump not at preset temperatureAllow time for the heat pump to reach the desired temperature
Blinking Green LightsOvervoltage (system may shut down)Allow the system to restart on its own automatically
Green Lights with Error CodePoor airflowEnhance airflow by cleaning air filters, vents, and coils
Frozen coilThaw the evaporator coil if frosted
Low refrigerantSeek expert assistance to identify and rectify coolant leakage
Malfunctioning thermistorReplace the thermistor if it is malfunctioning or lacks continuity
Electrical faultReset the breaker if it tripped; consult a professional for other electrical issues
Poor AC installationHave an expert inspect the system’s installation
Sensor ErrorInspect and replace any malfunctioning sensors
Communication ErrorAddress any communication errors within the system

What Do 2 Green Lights Mean On Mitsubishi Mini Split AC?

A Mitsubishi mini split AC heat pump has two green indicator lights, which reveal its status and potential issues.

One static green light means it’s close to the set temperature (within 68°F), and it still working to cool or heat your space.

When both lights are on, it’s far from the preset temperature (more than 68°F), but it will work until it reaches the target temperature.

Sometimes, the lights blink or display an error code like P6. Continuous blinking suggests overvoltage, while an error code indicates a detected fault. We’ll discuss these potential causes shortly.

Troubleshooting 2 Green Lights on Mitsubishi Mini Split

Before troubleshooting Mitsubishi mini split AC we must know the status of green light. The green light may be static, continually blinking, or accompanied by an error code.

Now lets discuss each case individually with troubleshooting,

1. Static Green Lights

As discussed above static green lights means that the heat pump is yet to reach its preset temperature.

As the lights don’t signal any concerning issues, there’s no immediate action required.

Simply allow the heat pump to continue working until it reaches the preset temperature, at which point the lights should turn off.

2. 2 Green Lights On Mitsubishi Mini Split Blinking

The frequent reason for a continuously blinking green light on a mini-split is typically a sudden surge in electrical voltage.

This voltage spike can pose a potential risk to the air conditioner, prompting the unit to activate its safety mode and automatically shut off.

This means you’ll observe blinking green lights, but the AC won’t be operational.

To resolve the issue of a continuously blinking green light due to a voltage surge on a mini-split AC:

  1. Wait for voltage stabilization; surges are often temporary.
  2. Try resetting the unit.
  3. Consider installing surge protection.
  4. If issues persist, consult a professional technician for inspection and repairs.

3. Blinking Green Light On Mitsubishi Mini Split Accompanied by An Error Code

A blinking green light with an error code on your Mitsubishi Mini Split AC indicates a detected issue.

These signals are diagnostic tools to identify and resolve problems with your mini-split AC effectively. Here are few reasons with troubleshooting,

A. Poor Airflow

When your mini-split AC experiences poor airflow, it’s typically due to blockages caused by clogged air filters, vents, or dirty coils.

These obstructions restrict the movement of air, leading to a decrease in the system’s ability to cool or heat effectively.

To fix this,

Clean the air filters, vents, and coils. Remove the dirt and debris that’s impeding airflow will enhance the system’s efficiency and improve its overall performance.

Regular maintenance in this regard is essential to ensure optimal operation of your mini-split AC.

B. Frozen Coil

When the coil, especially the evaporator coil, becomes frozen, it obstructs the cooling process.

This issue is often triggered by problems related to airflow, which can restrict the coil from functioning properly, or by insufficient refrigerant levels within the system.

To fix this,

To resolve a frozen coil, turn off the AC unit and let the coil thaw naturally. Additionally, it’s crucial to address the root causes.

If it’s due to poor airflow, clean air filters, vents, and coils.

If it’s caused by low refrigerant levels, consult a professional to locate and repair any refrigerant leaks and recharge the system as needed.

Fixing the underlying issues will prevent the coil from freezing again and ensure the unit operates efficiently.

C. Low Refrigerant

When your mini-split AC has a low refrigerant level, it can’t provide sufficient cooling or heating capacity.

This issue is frequently a result of a refrigerant leak, which causes the system to lose the necessary coolant.

To address low refrigerant, it’s crucial to consult a professional technician. They will locate and repair the refrigerant leak, which is vital for the system’s proper functioning.

After the leak is fixed, the technician will recharge the system with the correct amount of refrigerant to restore its cooling and heating capacity.

D. Malfunctioning Thermistor

The thermistor is a critical component responsible for regulating the temperature of your mini-split AC system.

When the thermistor malfunctions, it can lead to inaccurate temperature control, causing the unit to struggle in maintaining the desired temperature.

To fix this,

It’s necessary to replace the faulty thermistor with a functioning one. Professional assistance may be required to perform this replacement accurately.

E. Electrical Fault

Electrical faults can encompass various issues within the electrical components of your mini-split AC system.

These issues may include tripped breakers or other electrical problems that disrupt the normal operation of the unit.

To fix this,

If the issue is a tripped breaker, you can reset it to restore power to the system.

However, for more complex electrical problems, it’s essential to consult with an expert technician or electrician.

These professionals can safely diagnose and address electrical faults within the system to ensure it functions properly and safely.

Safety is a top priority when dealing with electrical issues, and professional expertise is recommended.

F. Poor AC Installation

When an AC system is poorly installed, it can result in a range of performance issues that impact both its efficiency and effectiveness.

These issues may include incorrect placement, faulty connections, or other installation-related problems.

To fix this,

I recommend you to have a professional technician inspect the system’s installation.

They can identify and rectify any installation-related issues. A properly installed system can significantly improve performance and longevity.

G. Sensor Error

Sensors play a vital role in maintaining accurate temperature and humidity control within your mini-split AC system.

When these sensors malfunction, it can result in inaccuracies in the system’s control, impacting its ability to effectively regulate temperature and humidity.

To fix this,

It’s necessary to inspect and replace any malfunctioning sensors. This replacement ensures that the system can regain precise control over temperature and humidity, allowing it to operate as intended and provide optimal comfort in your space.

Professional assistance may be required for accurate sensor replacement.

H. Communication Error

Communication errors within your mini-split AC system can occur due to various factors, including problems with wiring, connections, or issues with the control board.

These errors disrupt the system’s ability to communicate effectively between its components.

To fix this,

To address a communication error, it’s essential to identify and rectify the specific causes.

This may involve checking and fixing wiring, connections, or addressing control board problems.

By resolving these issues, you can restore proper communication within the system, allowing it to function as intended and provide efficient cooling or heating for your space.

Professional assistance may be necessary to diagnose and repair complex communication errors.

Troubleshooting Mitsubishi Mr. Slim Blinking Indicator Lights

Mitsubishi Mr. Slim, like its Mini Slim counterpart, relies on indicator lights to communicate potential issues within the system. These blinking or flashing indicator lights provide valuable insights, especially when accompanied by specific codes.

Here is summary of it,

Blinking Indicator LightsCode DisplayedIssue and ExplanationSolution
2 Green Flashes + 5 Red Flashes + Controller 6600Controller 6600Address confusion within the unit.Reset the Mitsubishi unit by quickly unplugging or turning off the isolator/breaker switch.
2 Green Flashes + 5 Red Flashes + Controller 6602Controller 6602Hardware malfunction or communication wiring fault.Consult an expert to inspect and repair the AC system.
2 Green Flashes + 5 Red Flashes + Controller 6606Controller 6606Failed communication involving the processor, possibly due to multiple interconnected systems not working in harmony.Engage an expert technician to diagnose and resolve the issue.
2 Green Flashes + 3 Red FlashesN/AUnit not responding to the remote control, often due to wiring or voltage issues.Seek professional assistance to diagnose and address the problem.
Mitsubishi Mr. Slim Troubleshooting Blinking LightN/AInterpret indicator light flashes to diagnose system issues.Refer to specific codes and solutions above.

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