中文
含义
长虹空调检测到压缩机排气温度传感器开路或短路，或者排气温度实际值超出安全限值，显示屏显示 E7 错误代码。压缩机排气温度是判断制冷系统运行状态和安全性的核心参数。当传感器开路/短路时主板无法获得有效数据，或当排气温度实测超过保护阈值（通常约 110°C–120°C）时，系统会触发 E7 保护并强制停止压缩机，防止因过热烧毁。
常见原因
- 压缩机顶部排气温度传感器（NTC 热敏电阻）老化损坏、开路或短路。
- 排气温度传感器与室外机主板的连接线断开、接头松动或氧化。
- 制冷剂严重不足或泄漏，导致压缩机回气过热度异常增大，排气温度急升超过安全限值。
- 电子膨胀阀或毛细管堵塞，制冷剂流量不足，压缩机吸气过热度过高。
- 系统真空不良，管路中混入空气等不凝性气体，导致排气温度异常升高。
- 室外机安装位置不当（通风不良、阳光直射），冷凝压力过高间接推高排气温度。
自助排查
- 立即停止空调运行并断开电源，让系统完全静置冷却至少 30 分钟。
- 检查室外机安装环境：确保出风口和进风口处无遮挡物，四周通风空间充足。
- 重新通电开机，将温度设置在 26°C–28°C、风速最大，观察 E7 是否快速重现。若在轻负载下仍触发，说明传感器本身或制冷系统存在严重故障。
- 注意观察——如果 E7 同时伴随制冷效果显著下降或完全不制冷，制冷剂泄漏的可能性较大。
- 排气温度传感器检修和制冷系统维护均需专业设备和资质。请联系长虹空调售后服务，由专业技师使用万用表检测传感器阻值并借助压力表判断制冷系统实际工况，排除泄漏或堵塞问题。
English
Meaning
The Changhong air conditioner has detected that the compressor discharge temperature sensor is open or short-circuited, or that the actual discharge temperature has exceeded the safety limit, displaying the E7 error code. Compressor discharge temperature is a core parameter for assessing refrigeration system operating status and safety. When the sensor is open/short-circuited, the main board cannot obtain valid data. When the measured discharge temperature exceeds the protection threshold (typically around 110°C–120°C), the system triggers E7 protection and forcibly stops the compressor to prevent burnout.
Common Causes
- The compressor top discharge temperature sensor (NTC thermistor) has aged and failed, or is open/short-circuited.
- The wiring between the discharge temperature sensor and the outdoor unit main board is disconnected, or the connector is loose or oxidized.
- Severely insufficient refrigerant or a system leak, causing abnormally high compressor suction superheat and a rapid rise in discharge temperature beyond the safety limit.
- A blocked electronic expansion valve or capillary tube, causing insufficient refrigerant flow and excessively high compressor suction superheat.
- Poor system vacuum with non-condensable gases (air) in the piping, causing abnormally elevated discharge temperature.
- Improper outdoor unit installation (poor ventilation, direct sunlight), where high condensing pressure indirectly pushes discharge temperature higher.
Self-Check Steps
- Immediately stop the AC and disconnect power. Allow the system to sit and cool down completely for at least 30 minutes.
- Check the outdoor unit installation environment: ensure the air outlet and intake are unobstructed and there is sufficient ventilation space on all sides.
- Reconnect power and start the unit with the temperature set to 26°C–28°C and fan at maximum. Observe whether E7 quickly reappears. If it triggers even under light load, there is a serious fault with the sensor itself or the refrigeration system.
- Take note — if E7 is accompanied by significantly reduced cooling or complete loss of cooling, a refrigerant leak is more likely.
- Discharge temperature sensor inspection and refrigeration system maintenance both require professional equipment and qualifications. Contact Changhong AC after-sales service for a professional technician to test sensor resistance with a multimeter and assess actual system conditions using pressure gauges, and address any leaks or blockages.