Gree AC E6 Error: Causes and Fixes for Pular and Livo+ Series

Key Takeaways

• An E6 error on Gree Pular and Livo+ series ACs means there is a communication malfunction between the indoor and outdoor units.
• Always check the communication wiring for damage or loose connections first, after safely cutting power to the unit.
• Working with AC electrical components carries a risk of severe electric shock; always cut power and wait for capacitor discharge. There are high-capacity electrolytic capacitors on the outdoor mainboard that can retain dangerous voltage for more than 20 minutes, and touching them prematurely can cause severe electric shock.
• If basic wiring checks do not resolve the E6 error, a qualified HVAC technician is required for further diagnosis and repair of mainboards or complex electrical faults.

What does a Gree AC E6 error mean?

A Gree AC E6 error code indicates a communication malfunction between the indoor and outdoor units of your air conditioner. This means the internal control systems of the two main components are unable to establish or maintain proper communication.

For Gree Pular series units, an E6 error means that during cooling operation, the compressor stops while the indoor fan motor operates. During heating operation, the complete unit stops. For Gree Livo+ series units, an E6 error also means the complete unit stops operation.

Diagnosis

Follow these steps to diagnose the cause of a Gree AC E6 error. Always prioritize safety by disconnecting power before any physical inspection.

1. Verify Power Supply:

• • Check: Ensure the AC unit is receiving stable power. Unstable power supply can cause communication issues. For Pular series units, an unstable supply voltage can cause overcurrent protection (E5) or malfunction of voltage dropping for DC busbar (U3), which may indirectly affect communication.
  • Result: If the power supply is fluctuating or outside the unit's rated operating voltage (e.g., 220-240V/50Hz/1 phase for Pular series, 208/230V/60Hz/1 phase for Livo+ series), address the power issue first.

2. Inspect Communication Wiring (Safety First):

• • Safety Warning: Before proceeding, switch off the dedicated circuit breaker for your AC unit. Wait at least 20 minutes after cutting power. There are high-capacity electrolytic capacitors on the outdoor mainboard that can retain dangerous voltage for more than 20 minutes, and touching them prematurely can cause severe electric shock.
  • Check: Visually inspect the communication wire that runs between the indoor and outdoor units. Look for any visible signs of damage, cuts, or frayed insulation. Check the terminal blocks at both the indoor and outdoor units to ensure the communication wire is securely connected and not loose.
  • Result: If the communication wire is loose, damaged, or improperly connected, this is a likely cause of the E6 error.

3. Observe Unit Behavior:

• • Check: Note the specific behavior of the unit when the E6 error appears. For Pular series, the compressor stops while the indoor fan operates during cooling, and the entire unit stops during heating. For Livo+ series, the complete unit stops.
  • Result: Consistent behavior matching the manufacturer's manual's description for E6 confirms a communication issue, rather than a different fault.

4. Consider Mainboard Malfunction:

• • Check: If the communication wiring appears intact and securely connected, the issue might stem from the control boards. For Livo+ series, possible causes include an abnormal indoor unit mainboard or an abnormal outdoor unit mainboard.
  • Result: Mainboard diagnosis and replacement require specialized tools and expertise. If wiring is ruled out, this points to an internal electronic fault.

Cause/fix table section

Running this AC on solar or UPS

Gree inverter split AC units, such as the Pular and Livo+ series, are designed to operate on a stable AC power supply. For Pular series, the power supply is 220-240V/50Hz/1 phase. For Livo+ series, it is 208/230V/60Hz/1 phase.

These units are inverter-type, meaning they use a variable-speed compressor for soft-starting and efficient operation. This soft-start capability is generally more forgiving on power sources like UPS or solar inverters compared to fixed-speed compressors, which have high inrush currents.

However, the manufacturer's manuals indicate that unstable power supply can lead to various error codes, including E5 (overcurrent protection) and U3 (malfunction of voltage dropping for DC busbar) on Pular series units, and PH/PL (DC bus-bar high/low voltage) on both Pular and Livo+ series. The manufacturer's manuals do not explicitly state a minimum start voltage or specific inrush current figures, nor do they detail published behavior on generator or UPS supply.

When running a Gree inverter AC on a solar inverter or UPS, ensure the power source can provide a stable voltage and frequency within the unit's specified operating range. The solar inverter or UPS must be adequately sized to handle the AC's rated cooling power input (e.g., 1290W for a GWH18AGDXE-K6DNA1A Pular unit or 1800W (570~2600W) for a GWC18QD-D3DNA6E(LC) Livo+ unit) and any transient loads, even with soft-start. Continuous operation on an unstable supply can lead to component damage and repeated error codes.

Safety: Electrical and Refrigerant Hazards

Working with AC units involves significant electrical and chemical hazards. Always exercise extreme caution.

• Electrical Shock Hazard: Before performing any inspection or maintenance, always cut off the main power supply to the unit at the circuit breaker. Wait at least 20 minutes after disconnecting power. There are high-capacity electrolytic capacitors on the outdoor mainboard that can retain dangerous voltage for more than 20 minutes, and touching them prematurely can cause severe electric shock. All electrical work must be performed by a licensed technician.
• Grounding: The unit must be properly grounded to prevent electric shock. The yellow-green wire is the grounding wire and must not be used for any other purpose. Grounding resistance must comply with national regulations.
• Refrigerant Hazards: Gree Pular series units use R32 refrigerant, which is a flammable gas. Appliance filled with flammable gas R32. Can lead to explosion under certain conditions, but flammability is very low. Can be ignited only by fire. Avoid contact between refrigerant and fire, as it generates poisonous gas. Appliance shall be stored in a room without continuously operating ignition sources (e.g., open flames, operating gas appliance, operating electric heater). Ensure no air remains in the refrigerant line during installation or service. If a refrigerant leak occurs, take immediate measures to minimize its density in the area. Never touch refrigerant piping or the compressor without appropriate gloves to prevent scalds or frostbite. Only apply the specified refrigerant; never mix refrigerants.
• Installation and Maintenance: Improper installation or maintenance can lead to fire, explosion, electric shock or injury. All installation and maintenance procedures must be carried out by a distributor or a qualified person.

When to call a technician instead

While basic troubleshooting like checking power supply and visible wiring can be done by the homeowner, many issues, especially those related to the E6 communication error, require professional expertise.

You should call a qualified HVAC technician if:

• The E6 error persists after you have safely checked and confirmed that the communication wiring is securely connected and undamaged.
• You suspect a fault with the indoor unit mainboard or outdoor unit mainboard. These components are complex and require specialized diagnostic tools and knowledge for repair or replacement.
• You are unsure about any step in the troubleshooting process, especially those involving electrical components or refrigerant lines.
• The issue involves refrigerant leaks or system blockages, which require specialized equipment and certified personnel to handle safely and effectively.
• Any electrical component needs replacement or repair beyond simple wire re-connection. All electric work must be performed by a licensed technician.
• Your unit is still under warranty. Attempting complex repairs yourself may void the warranty.

A qualified technician has the training, tools, and experience to safely diagnose and repair complex AC issues, ensuring the unit operates correctly and safely.