中文
含义
E4 为压缩机排气温度过高保护。当压缩机排气管温度传感器检测到排气温度超出允许上限（通常 ≥110℃）并持续一定时间后，控制器触发保护停机，防止压缩机因高温老化或烧毁。
常见原因
- 制冷剂不足导致压缩机回气量过少，排气温度快速升高。
- 冷凝器散热不良（脏堵或风机故障），冷凝压力与温度升高，连带排气温度上升。
- 系统中有不凝性气体（如空气、氮气），占用冷凝器换热面积，导致排气温度异常。
- 压缩机排气温度传感器故障，信号漂移导致误报。
- 电子膨胀阀开度过小或毛细管堵塞，冷媒循环量不足。
自助排查
- 检查室外机冷凝器是否脏堵，清洁翅片确保散热良好。
- 确认室外风机正常运转，风速正常。
- 观察空调制冷或制热效果，若效果明显下降且管路无结霜，可能存在制冷剂不足。
- 如空调近期经过维修（如更换压缩机或管路焊接），可能系统内混入空气，需要专业人员重新抽真空后充注。
- 若以上检查均正常但仍频繁报 E4，请联系格力售后服务中心安排上门检测。
English
Meaning
E4 indicates compressor discharge temperature over-limit protection. When the discharge pipe temperature sensor detects that the discharge temperature exceeds the allowed upper limit (typically ≥110°C) for a sustained period, the controller triggers protection and shuts down to prevent compressor damage from overheating or burnout.
Common Causes
- Insufficient refrigerant causing low suction gas return and rapid discharge temperature rise.
- Poor condenser heat dissipation (dirty fins or fan failure), raising condensing pressure and temperature, which in turn elevates discharge temperature.
- Non-condensable gases (e.g., air, nitrogen) in the system, occupying condenser heat exchange area and causing abnormal discharge temperature.
- Faulty discharge temperature sensor with signal drift causing false readings.
- Electronic expansion valve opening too small or capillary tube blockage, resulting in insufficient refrigerant flow.
Self-Check Steps
- Check whether the outdoor condenser is dirty; clean the fins to ensure adequate heat dissipation.
- Confirm the outdoor fan is operating normally at proper speed.
- Observe cooling or heating performance. If performance is noticeably degraded without visible frost on pipes, refrigerant may be low.
- If the unit was recently serviced (e.g., compressor replacement or pipe welding), air may have entered the system. A qualified technician must re-evacuate and recharge the system.
- If all checks above pass but E4 continues to appear, contact Gree after-sales service for an on-site inspection.