Gree Air Conditioner E3 Error — What It Means & How to Fix It

What Does This Error Mean?

E3 on a Gree air conditioner means communication between the indoor and outdoor units has been lost. A power reset often resolves E3. If it persists, the communication wiring between the units needs to be inspected.

Affected Models

Gree Livo
Gree Sapphire
Gree Vireo
Gree Versati
Gree mini-split units

Common Causes

Communication wire between indoor and outdoor units loose or damaged
Power surge disrupting the communication circuit
Outdoor unit not receiving power
Control board in the indoor or outdoor unit has failed
Incorrect wiring after a recent installation or service

How to Fix It

Turn off the AC at the unit and at the circuit breaker. Wait 5 minutes, then restore power.

A power surge or brief communication dropout causes E3. A full power reset re-establishes the communication link in most cases.
Check that the outdoor unit has power — listen for the fan or compressor starting.

If the outdoor unit is completely silent after restart, it may have no power. Check the outdoor unit's dedicated circuit breaker or isolator switch.
Visually inspect the communication wire connections at the indoor unit terminal block.

The indoor unit has a terminal strip where the inter-unit communication wire connects. Ensure none of the terminals are loose. Do not open the outdoor unit yourself.

When to Call a Professional

E3 that returns after every power reset requires an HVAC technician to check the inter-unit communication wiring and both control boards. Do not attempt to inspect or modify the wiring yourself.

Frequently Asked Questions

Can a power outage cause E3 on a Gree AC?

Yes — a sudden power cut or surge can disrupt the communication handshake between the indoor and outdoor units. A power cycle after power is restored usually clears E3 caused by an outage.

Is E3 covered under Gree warranty?

If E3 is caused by a component fault (control board, communication board), it is covered under warranty. If caused by improper installation or physical wiring damage, it typically is not. Contact Gree service with your model and serial number.