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a person installing the power supply for a mini split condenser

Gree Mini Split Error Codes: What They Are and How to Resolve Them

Your Gree mini split air conditioner uses error codes to inform you of what issue or problem is currently preventing your unit from operating correctly. Understanding what the error code means is the first step for troubleshooting the problem and getting your system operational again. 
a person installing the power supply for a mini split condenser

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Error Codes Starting with E

  • E1:This error code indicates the unit is experiencing high pressure. The most common causes of increased pressure in your Gree mini split air conditioner are dirty coils, failed fans, overcharging, or a faulty high-pressure switch.

    To resolve the E1 error code, check your coils and fans to see if they are functioning properly. If you have clean coils and a working fan, you’ll need a technician to come to inspect the unit’s high-pressure switch and check if the unit has been overcharged.

  • E3:A leak or restriction in the system is causing low pressure. This can occur if the filter, fan, or evaporator is dirty.

    Inspect the outdoor unit for any dirt buildup. At the same time, check if any noticeable leaks are coming from the system. If there is no build-up of dirt or you notice a leak, you’ll need to call a technician to resolve the issue. 

  • E5: The E5 error code signals that the unit has entered over current protection mode. This happens when the line voltage to the unit is too high or when the low supply voltage is unstable. 

    If you notice this error code, call a technician to help. They can inspect the electrical lines running to the unit for the proper voltage. With that information, they should be able to resolve the issue. 

  • E7: This error appears when the outdoor unit and the indoor unit are set to different modes. When one unit is in heat mode and one unit is in cooling mode, your indoor display will show the E7 mode conflict error. 

    To resolve this error code, inspect both the indoor and outdoor units. Switch the units to the desired mode, ensuring they match for correct functionality. 

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a man adjusting the temperature of a mini split with a remote

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Error Codes Starting with F

These error codes indicate that a sensor is not functioning as expected. The only way to resolve these error codes is to have the malfunctioning sensor replaced by a skilled technician. When a sensor malfunctions, you may want to contact your HVAC provider and Gree tech support to see if the parts could be covered under warranty. 

  • F1: Indoor ambient sensor malfunction
  • F2: Indoor evaporate sensor malfunction
  • F3: Outdoor ambient sensor malfunction
  • F4: Outdoor tube sensor malfunction
  • F5: Exhaust sensor malfunction

Error Codes Starting with H

  • H1: The unit has entered defrost mode. This occurs when the control sensor of the outdoor heat exchanger activates and switches off heat injection to the indoor unit. Heat is diverted to the outdoor unit to defrost it. 

    This error code can resolve itself if the defrost mode works correctly. You can inspect the outdoor unit to see if the process is working. If not, your unit may have a problem with the control sensor or heat exchanger, requiring an experienced technician. 

  • H5: This error indicates that the intelligent power module has entered protection mode. Protection mode controls under-voltage and over-voltage issues, as well as over-temperature and short circuit issues. Your unit will need service to resolve this issue. 

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Other Error Codes

These error codes will likely involve a service visit to resolve, as they may involve issues with the outdoor or indoor unit hardware and electrical connections. 

  • C5: There is an issue with the jumper. The indoor board should be replaced, and the jumper moved from the old board to the new board. Some models have an outdoor jumper, as well, that would follow the same resolution process. 
  • U3: The unit has detected a voltage drop on the DC bus bar. Your technician will inspect the line to check that the line voltage is stable and within range. If everything checks out, then the outdoor main board will need to be replaced.  
  • L9: Unit is in power protection mode. This may be due to a significant power surge, such as a lightning strike.  

a technician performing repair and maintenance on a mini split unit

Source: David Spates/

Your Caring HVAC Provider

At ComfortUp, we understand you just want an HVAC system that works. Our experienced technicians work tirelessly to resolve any issue that arises. We are proud to work with the manufacturers of the HVAC systems we install to provide repairs under warranty, saving you money. Turn to us for all your home and office HVAC needs. 

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