E6
Gree Split AC
Severity: ModerateWhat Does This Error Mean?
E6 means the indoor and outdoor units have lost communication with each other. The indoor unit cannot control the outdoor unit, so the AC shuts down. A damaged communication wire is the most common cause.
Affected Models
- Gree FAIRY Series
- Gree LOMO Series
- Gree U-MATCH Series
- Gree PULAR Series
- Gree Inverter Split System
Common Causes
- Damaged or broken communication wire between indoor and outdoor units
- Loose or corroded connector at the indoor or outdoor PCB terminal block
- PCB (control board) fault on either the indoor or outdoor unit
- Power supply problem at the outdoor unit preventing it from responding
- Electrical interference from nearby equipment disrupting the signal
How to Fix It
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Turn the AC off at the wall switch or circuit breaker and wait 5 minutes.
A complete power cycle clears temporary communication glitches. This resolves E6 in a surprising number of cases.
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Check that the outdoor unit has power — look for an indicator light on the outdoor unit or listen for it powering on.
If the outdoor unit has no power at all, it cannot respond to the indoor unit. Check the dedicated outdoor unit circuit breaker.
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Visually inspect the communication cable where it exits the indoor unit and enters the outdoor unit, checking for obvious damage, cuts, or pinching.
This is the thin multi-core cable running between the units alongside the refrigerant pipes. Rodent damage and sharp bends are common failure points.
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If accessible, check the terminal block connections inside the indoor unit panel (turn power off first). Push each wire connector firmly to reseat it.
A loose terminal connection can cause intermittent E6 faults that are difficult to diagnose. Reseating connectors costs nothing.
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Restore power and restart. If E6 returns, call a technician to test the communication circuit and PCBs.
A technician can use a multimeter to verify continuity on the communication wires and test each PCB systematically.
When to Call a Professional
Call a technician if a power cycle does not clear E6. Inspecting and replacing communication wiring or PCBs requires professional skills and safety knowledge. Working near the outdoor unit involves high-voltage components — do not open the outdoor unit yourself.
Frequently Asked Questions
Can a power outage cause the E6 error?
Yes — a sudden power outage or brownout can disrupt the communication handshake between the two units. Try a full power cycle first: switch off at the breaker, wait 5 minutes, then restart. If E6 clears and does not return, the outage was the cause.
How long does it take to fix an E6 communication fault?
If it is a wiring issue, a technician can usually trace and repair the cable in 1–2 hours. If a PCB needs to be replaced, it may take a day or two for parts to arrive. Simple connector reseating takes less than 30 minutes.
Could E6 be caused by installing the AC myself?
Yes — incorrect wiring during installation is a common cause of E6. The communication wire must connect terminal L to L and N to N at both units exactly as specified in the manual. A reversed or missing wire will cause E6 immediately after installation.