Gree E5 error code: overcurrent and supply voltage protection
Gree E5 is an overcurrent protection trip, which Gree ties to high line voltage or an unstable low supply. Why mains voltage matters, and where the diagnosis needs a technician.
What this means
Gree assigns E5 to an overcurrent protection trip. The control has seen the compressor circuit draw more current than its limit, and Gree links this to a supply voltage that is too high or that sags and swings under load. It points at the electrical supply, the connections, or the compressor and its drive rather than one named part.
Equipment and model context
Gree residential mini-splits that publish E5 in the protection code family
- Sapphire
- Livo
- Vireo
- Multi21+ indoor heads
This reading follows the Gree code overview and service literature for the residential mini-split families that publish E5 as a protection code. Other Gree ranges and other brands can map these characters differently, so match the indoor and outdoor model plates first.
What you may notice
- The indoor unit shows E5 and stops, often a short time after the compressor starts or when it ramps up under load.
- Lights in the home dim when the outdoor unit starts, or the E5 trips coincide with other heavy appliances running.
Likely causes
- A supply voltage outside the equipment range, a sagging voltage under starting load, or a swinging voltage from a weak service or a long undersized feed raises the current the compressor draws.
- Loose or corroded connections at the isolator, terminal block, or contactor add resistance and heat, and a failing capacitor, contactor, or compressor can raise current on its own.
Diagnostic paths
E5 tracks with household electrical load
The trips happen when a cooker, kettle, shower, or another large load is running, or the lights visibly dim when the outdoor unit starts.
Have an electrician or technician measure the supply voltage at the outdoor unit while it starts and runs, and check the size and length of the feed. A voltage that sags under load points at the supply, not the air conditioner.
E5 happens regardless of what else is running
The trips occur at any time of day with no relationship to other appliances, and the measured mains voltage at rest is within range.
Arrange a technician to check the connections at the isolator and terminal block for heat and looseness, and to test the run capacitor, contactor, and compressor current draw against the service data.
A compressor draws the power it needs to do its work. If the supply voltage drops, it pulls more current to keep that power, and the control trips E5 when the current passes its limit.
- Mains supplyDelivers voltage to the outdoor unit
- Isolator and connectionsAny looseness here adds resistance and voltage drop
- Compressor and driveDraw more current when voltage is low
- Current sensingThe control monitors the compressor circuit current
- E5 tripCurrent above the limit stops the compressor
| When E5 trips | More likely area | Confirmed by |
|---|---|---|
| With other heavy loads, lights dimming | Supply voltage sag or a weak, undersized feed | Voltage logged at the unit during a start |
| Any time, mains voltage normal at rest | Loose connection, capacitor, contactor, or compressor | Connection inspection and current readings |
| Only in the hottest weather at full load | Marginal supply or a tired compressor near its limit | Current draw compared with the rated maximum |
Why voltage and current are linked here
A compressor has a job to do that takes a certain amount of power, and power is voltage multiplied by current. When the supply voltage sags, the compressor and its inverter drive respond by drawing more current to keep the power up. The control watches the current in the compressor circuit, and when it climbs past the protection limit it raises E5 and stops, because sustained overcurrent overheats windings and electronics.
This is why Gree describes E5 in terms of the supply. A mains voltage that is fine at rest but drops when the house load rises, or a long thin cable feeding the outdoor unit, produces a sag exactly when the compressor is working hardest. The air conditioner then reads its own high current and trips, even though nothing inside it has failed.
Where owner observation ends
The owner-safe part is watching for a pattern. Note whether the E5 trips line up with other big appliances, whether the lights dim when the outdoor unit starts, and whether the trips only happen in the hottest weather when the unit runs at full load. Those observations tell a technician whether to start at the electrical supply or inside the unit.
Everything measured is technician or electrician work. Logging the voltage at the outdoor terminals during a start, checking the feed size and length against the installation requirement, inspecting the isolator and terminal connections for heat, and reading the compressor current against the rated maximum all mean working at energised terminals. A capacitor, contactor, or compressor is only replaced after those readings, not on the code alone.
What to give the technician
Report the indoor and outdoor model numbers, whether E5 trips relate to other appliances or to hot weather, whether the lights dim on start, and how soon after the compressor starts the code appears.
Safe homeowner checks
- Note whether E5 trips coincide with other large appliances running and whether the lights dim when the outdoor unit starts.
- Check that the isolator switch by the outdoor unit is fully on and shows no scorching or a burnt smell, without opening it.
Is a reset appropriate?
One restart shows whether E5 was a single event. If it returns, especially under load, leave the system off, because repeated overcurrent trips stress the compressor and drive.
When to call a technician
- Measuring supply voltage under load, checking the feed size, inspecting energised connections, and testing the capacitor, contactor, and compressor current require a qualified technician or electrician.
Questions people ask about this
Does Gree E5 mean the compressor is failing?
Not necessarily. E5 is an overcurrent trip, and Gree links it to supply voltage. A sagging or swinging mains, a weak feed, or a loose connection raise the current before any part has failed.
Why does E5 trip when other appliances are on?
Heavy household loads pull the mains voltage down. The compressor then draws more current to keep its power up, and the control trips E5 when that current passes its limit.
Can I fix Gree E5 by resetting it?
A reset only clears the code. If the supply voltage or a connection is the cause, E5 returns under load, and repeated overcurrent trips are hard on the compressor and drive.
Evidence recordHow this page was checked
official manufacturer support article, service manual · checked 2026-09-09
Every technical claim above was written from primary documentation held in the HVAC Bench evidence record: Gree Comfort technical literature. Where a source limits a definition to certain models, test conditions, or product classes, that limit is repeated here rather than generalised.
- Documentation class
- official manufacturer support article, service manual
- Scope of the definition
- Gree residential mini-splits that publish E5 in the protection code family
- Last checked
- 2026-09-09