Gree Mini Split E4 Error Code

Updated 2026-08-29 · review status: manual-verified Last verified: 2026-08-29

Quick answer

E4 returns after filters and outdoor clearance are corrected. Tell them the code is compressor high discharge temperature. Technician boundary Stop here: refrigerant or sealed-system and compressor work is technician-only. Do not open panels, test capacitors, touch wiring, connect gauges, add refrigerant, or keep resetting the system.

Severity: high · DIY difficulty: intermediate

Safety

Only clean filters and airflow. Discharge-temperature diagnosis involves thermistors, refrigerant charge, and compressor health - do not open panels, connect gauges, or add refrigerant.

What E4 means

E4 means the compressor discharge temperature is too high. Poor airflow or low charge can drive it, but repeated E4 faults point to a refrigerant-circuit or compressor problem that needs a technician. Do not keep running or resetting the system.

Code meaning varies by series

  • Livo / R32 residential splits: Compressor discharge over-temperature protection

Causes, ranked

  1. 1. Dirty filters or blocked airflow over the outdoor coil occasional diy-ok

    Check: Wash indoor filters; clear leaves, snow, and debris around the outdoor unit.

    Fix: Clean airflow paths, power cycle once; if E4 returns, call a technician.

  2. 2. Low charge or refrigerant leak reducing compressor cooling occasional pro-only

    Check: Needs pressure/temperature measurements by a licensed tech (EPA 608 for refrigerant work).

    Fix: Technician: leak test, recover and recharge to nameplate charge.

  3. 3. Discharge temperature sensor reading outside range occasional pro-only

    Check: Sensor resistance testing against the manual chart.

    Fix: Technician: test and replace the discharge thermistor if out of spec.

  4. 4. Compressor running hot (failing valve, windings) or outdoor board fault occasional pro-only

    Check: Technician-only compressor amp draw and superheat analysis.

    Fix: Technician: diagnose compressor and outdoor PCB.

Related codes

gree/e1 · gree/e3 · gree/e5

Commonly searched as: "gree e4" · "gree error code e4" · "gree air conditioner e4"

Sources

  • GREE E4 error code - SplitAtlas — verified 2026-08-29
  • Gree Mini Split Error Codes - Heat Pump Answers — verified 2026-08-29