Knowledge base
Gree fault codes
U-Match • Free Match
Gree fault codes for air conditioners, multi-splits and heat pumps. Start with the exact unit model: E1 can mean high-pressure protection, E6 a communication fault and F0 a refrigerant-related protection on supported ranges. F0 alone does not confirm a leak; H1 usually indicates defrost in heating mode. Open the matching code page and check its model scope and source before troubleshooting.
Gree fault codes by product family
A code can mean different things depending on the range: open the sheet for the exact model.
E1 • Split / GMV
Fault Code E1 Gree: High Pressure — Causes and Repair
On supported Gree ranges, E1 is a high-pressure protection. The code alone does not identify whether airflow, the fan or the refrigerant circuit caused it.
E6 • Supported Gree ranges; check the exact model
Gree E6: communication fault by model
On supported Gree ranges, E6 indicates a communication fault between indoor and outdoor units. Bus type, terminals and detection period depend on the exact model.
H6 • Wall-mounted / Console
Fault Code H6 Gree: Anti-freeze / Defrost — Procedure
Fault code H6 indicates that the electronic control board does not detect rotation of the indoor fan (no Hall sensor feedback).
F0 • Lomo / Fairy / Bora
Gree F0: refrigerant protection by model
On supported Gree models, F0 is a refrigeration protection. Low refrigerant can be one cause, but the code alone does not confirm a leak or a failed component.
C5 • Split / U-Match
Fault Code C5 Gree: Missing Jumper Cap
Code C5 is a pure configuration error. On the PCB, a small jumper cap (plastic plug with a wire) defines the unit size. If it is missing, the air conditioning will not start.
P0 • Inverter
Fault Code P0 Gree: IPM Module Protection (Inverter)
Code P0 relates to the outdoor electronic board (power section). The module that drives the compressor (IPM) is overheating or detecting an electrical anomaly.
H1 • All ranges
Gree Fault Code H1: Not an Error (Defrost Cycle)
Fault code H1 is often mistaken for a breakdown by users. It simply means the unit is defrosting the outdoor unit (Heating Defrost).
E4
Gree E4 fault code: causes, diagnosis and solution
The E4 fault code indicates discharge gas overheat protection when the temperature exceeds 115°C. The system stops automatically to prevent compressor damage.
H3
Gree fault code H3: causes, diagnosis and solution
Fault code H3 indicates compressor overload protection. It triggers when the OVC-COMP interface on the main PCB is open for more than 3 seconds, or when overheating is detected by the protection switch.
H7
Gree fault code H7: causes, diagnosis and solution
Fault code H7 indicates compressor out-of-step protection, triggered when the rotor position cannot be detected or the actual speed differs too much from the set speed. This fault stops the compressor during operation to protect the system.
H5
Gree H5 Fault Code: Causes, Diagnosis and Solution
The H5 fault code indicates IPM module protection (Current Protection) on the compressor control board. This fault is triggered when the F0 pin of the IPM module remains at a low level, causing the system to stop to prevent damage.
P5
Gree fault code P5: causes, diagnosis and solution
Fault code P5 indicates compressor phase overcurrent protection. The system detects an instantaneous current value above the set protection threshold, causing the system to stop to prevent damage.
E8
Gree E8 fault code: causes, diagnosis and solution
The E8 fault code indicates overheating protection triggered when temperature sensors detect values exceeding the permitted threshold. This protection activates on start-up or in the event of an airflow fault.
U1
Gree fault code U1: causes, diagnosis and solution
Fault code U1 indicates a failure of the phase current detection circuit for the compressor. This fault, classified as a hardware failure, causes the compressor to stop to protect the system.
F6
Gree Fault Code F6: Causes, Diagnosis and Solution
Fault code F6 indicates a pipe temperature sensor anomaly on the outdoor unit (ODU) detection circuit, causing compressor frequency limitation or reduction. The system detects an AD value out of range for 5 consecutive seconds.
P1
Gree fault code P1: causes, diagnosis and solution
Fault code P1 on Gree Sapphire 18MBH and 24MBH models indicates a compressor nominal frequency anomaly during the test state. This fault occurs specifically during nominal cooling or heating cycles.
P2
Gree fault code P2: causes, diagnosis and solution
Fault code P2 (No.25) indicates a compressor maximum frequency issue detected during a test state. This fault appears exclusively during maximum cooling or heating tests.
P3
Gree fault code P3: causes, diagnosis and solution
Fault code P3 (No. 26) indicates an intermediate frequency anomaly of the compressor detected during the test state. This message is displayed specifically when the system is in intermediate cooling or heating mode.
FH
Gree FH fault code: causes, diagnosis and solution
The FH fault code indicates a limitation or reduction in compressor frequency due to anti-freeze protection. Although all loads operate normally, this protection activates to prevent system freezing.
LC
Gree Fault Code LC: Causes, Diagnosis and Solution
Fault code LC indicates a start failure of the AC (inverter) compressor. This fault manifests as a compressor lock in cooling or dry mode, or a complete unit shutdown in heating mode.
E2
Gree fault code E2: causes, diagnosis and solution
Fault code E2 on Gree air conditioning units indicates anti-freeze protection activated when the evaporator pipe temperature drops below the safety threshold. This protection activates during cooling or dry modes to prevent evaporator freezing by stopping the compressor and outdoor fan while keeping the indoor fan running.
EE • All ranges
Fault Code EE Gree: EEPROM Memory Error
Fault code EE (or E-E) means the processor cannot read data from the EEPROM memory (the 'brain' that stores settings).
E5 • Selected Gree ranges; confirm the model
Gree E5: overcurrent protection on supported models
On several documented Gree ranges, E5 is an overcurrent protection. The applicable threshold and checks depend on the model. E5 alone does not prove a compressor fault.
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