Gree AC Error Codes : What They Mean and How to Fix Them

Gree is one of the largest air conditioner manufacturers in the world, known for reliable, energy-efficient systems. Like most modern AC units, Gree models are built with self-diagnostic technology that displays error codes whenever something goes wrong.

These codes aren’t random – they’re designed to tell you exactly where the problem lies, whether it’s a sensor fault, communication error, refrigerant issue, or electrical protection trigger.

If your Gree AC has stopped cooling properly or is flashing an error code on the display or remote, understanding what that code means can help you:

• Fix simple issues yourself, such as cleaning filters or resetting the system.
• Know when to call a technician for more complex problems.
• Save time and money by giving accurate fault information upfront.

In this guide, we’ll cover the full list of Gree AC error codes, explain their causes, and outline the best steps to take when they appear.

Gree AC Error Codes List

Indoor Unit Error Codes

Sensor Faults

• E1 – Room temperature sensor open/short
• E2 – Evaporator (indoor coil) sensor open/short
• E3 – Indoor fan speed error (motor locked, abnormal RPM)
• E4 – Condenser (outdoor coil) sensor fault (sometimes mapped to indoor coil in cassettes)
• E5 – Indoor EEPROM/PCB communication error
• E6 – Communication error between indoor and outdoor units
• E7 – Mode conflict (different indoor units set to heating and cooling simultaneously in multi-split systems)
• E8 – Water drainage fault / float switch triggered (cassettes, floor-stand)
• E9 – Indoor fan motor feedback error

Outdoor Unit Error Codes

Protection & Electrical

• F0 – EEPROM parameter error (outdoor PCB)
• F1 – High pressure protection (refrigerant system)
• F2 – Low pressure protection
• F3 – Discharge temperature protection (compressor)
• F4 – Suction temperature protection
• F5 – Overcurrent protection
• F6 – Module communication error (inverter module fault)
• F7 – Voltage protection (overvoltage/undervoltage)
• F8 – Compressor motor protection
• F9 – Outdoor fan motor error
• FA – IPM protection (Intelligent Power Module)
• Fb – PFC (Power Factor Correction) module protection

Advanced Outdoor Protections (VRF/Commercial)

• P0 – Inverter module protection
• P1 – Voltage protection (supply out of range)
• P2 – Compressor top temperature protection
• P3 – Outdoor DC fan error
• P4 – Compressor drive error
• P5 – Compressor current overload
• P6 – DC bus voltage protection
• P7 – Compressor start failure
• P8 – IPM current protection
• P9 – DC voltage sensor fault

Communication & Addressing Errors

• H1 – Indoor unit EEPROM error
• H2 – Wired controller communication error
• H3 – Communication mismatch between indoor units (multi-split)
• H4 – Address conflict error
• H5 – Group control wiring fault
• H6 – Indoor/outdoor communication protocol mismatch

Status / Reminder Codes (Not Faults)

• CL – Filter cleaning reminder
• dF – Defrost mode (normal in heating)
• H0 – Pre-heating / standby mode

Conclusion

Gree air conditioners are equipped with advanced self-diagnostic systems that make it easier to detect and address problems before they turn into major breakdowns. Each error code points directly to a specific fault whether it’s a sensor issue, communication problem, refrigerant protection, or inverter module fault.

For homeowners, these codes serve as useful indicators that guide simple fixes, like cleaning filters, clearing blocked drains, or resetting the system. For technicians, they provide a fast diagnostic starting point, saving time and reducing guesswork.

That said, many codes—especially those linked to pressure protection, inverter errors, or compressor faults should be handled by a qualified HVAC engineer. Regular servicing, filter cleaning, and keeping the outdoor unit clear of debris will prevent many of these issues and extend the life of your system.

Bottom line: Error codes are not just warnings, they’re valuable tools. By understanding them, you can act quickly, protect your investment, and keep your Gree AC running efficiently and reliably all year round.