How to Fix an “EE” Code on a YMGI Mini Split: A Comprehensive Troubleshooting Guide

The “EE” error code on a YMGI mini split system is a common issue that indicates a communication problem between the indoor and outdoor units. This comprehensive guide will walk you through the step-by-step process to identify and resolve the underlying cause of the “EE” code, empowering you to fix the issue and restore your HVAC system to optimal performance.

Identifying the Specific “EE” Error Code

The “EE” code on YMGI mini split systems can have several variations, each corresponding to a different problem. Before attempting any repairs, it’s crucial to identify the specific “EE” error code displayed on your system. This information will guide you in the troubleshooting process and help you determine the appropriate course of action.

To identify the “EE” error code, consult your YMGI mini split system’s user manual or the manufacturer’s website. The manual will provide a detailed breakdown of the various “EE” error codes and their corresponding meanings. Alternatively, you can contact YMGI’s customer support team for assistance in deciphering the specific error code.

Troubleshooting the “EE” Error Code

how to fix an ee code on ymgi mini splitImage source: Flickr

Once you have identified the specific “EE” error code, you can begin the troubleshooting process. Here are the steps to follow:

1. Check the Wiring Connections and Sensors

The “EE” error code on a YMGI mini split system is often caused by issues with the wiring connections or sensor malfunctions. Start by thoroughly inspecting the following components:

  1. Wiring Connections: Ensure that all wiring connections between the indoor and outdoor units are secure and free from damage. Check for any loose, frayed, or corroded wires, and make any necessary repairs or replacements.

  2. Sensors: Inspect the various sensors in the system, including the indoor room temperature sensor (T1), evaporator temperature sensor (T2), condenser temperature sensor (T3), outdoor ambient temperature sensor (T4), and compressor discharge temperature sensor (T5). Check for any signs of damage, such as shorts, breaks, or malfunctions, and replace the sensors if necessary.

To check the sensors, you can use a multimeter to measure the resistance across the sensor terminals. Refer to the manufacturer’s specifications to ensure the sensor readings are within the acceptable range.

2. Inspect the Computer Board (PCB)

If the wiring connections and sensors appear to be in good condition, the issue may lie with the computer board (PCB) of the YMGI mini split system. The PCB is responsible for processing the sensor data and communicating between the indoor and outdoor units.

If the PCB is not receiving the correct voltage or data from the sensors, it can trigger the “EE” error code. Unfortunately, troubleshooting and repairing the PCB often require specialized knowledge and tools, and it may be best to have a qualified HVAC technician handle this task.

3. Perform Regular Maintenance

Regular maintenance of your YMGI mini split system can help prevent the occurrence of “EE” error codes and other issues. Here are some maintenance tasks you should perform regularly:

  1. Clean Filters: Regularly clean or replace the air filters in both the indoor and outdoor units to ensure proper airflow and prevent the buildup of dust and debris.

  2. Clear Debris: Inspect the outdoor unit and clear any debris, such as leaves, twigs, or vegetation, that may be obstructing the airflow around the unit.

  3. Check Valves: Inspect all valves, including the service valves, and tighten or replace them if necessary to prevent refrigerant leaks.

  4. Clean Coils: Regularly clean the indoor and outdoor coils to maintain efficient heat transfer and prevent the buildup of dirt and grime.

  5. Check for Refrigerant Leaks: Perform a thorough inspection of the system for any signs of refrigerant leaks, such as hissing sounds or a decrease in cooling performance.

By following these maintenance steps, you can help prevent the “EE” error code and other issues from occurring, ensuring your YMGI mini split system operates at its best.

When to Call a Professional

While some troubleshooting and repair tasks can be performed by a DIY enthusiast, certain issues with the “EE” error code may require the expertise of a qualified HVAC technician. If you are unable to identify the specific cause of the “EE” error code or if the repairs involve the computer board (PCB), it is recommended to call a professional for assistance.

HVAC technicians have the necessary training, tools, and experience to diagnose and repair complex issues with mini split systems. They can also provide guidance on proper maintenance practices to help prevent future “EE” error code occurrences.


By following the comprehensive troubleshooting steps outlined in this guide, you can effectively identify and resolve the “EE” error code on your YMGI mini split system. Remember to always prioritize safety, consult the manufacturer’s instructions, and consider calling a professional if the issue is beyond your expertise. With the right approach, you can restore your HVAC system to optimal performance and enjoy the comfort of your home.


  1. YMGI Group – Product Error Codes
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  3. YMGI Group – Updated Error Codes for YMGI Systems