中文
含义
室外机化霜温度传感器开路或短路，影响化霜功能启停。
常见原因
- 化霜传感器插头松动或接触不良
- 传感器本身开路或短路损坏
- 传感器线束在室外长期日晒老化
- 探头与室外换热器脱离导致检测不准
- 化霜传感器型号不匹配（阻值特性不同）
自助排查
- 断电后重新插拔室外机化霜传感器接头
- 用万用表测量传感器阻值，低温时应明显增大
- 检查传感器探头是否牢固固定在换热器盘管上
- 观察化霜时传感器阻值变化是否与温度对应
- 若阻值异常，更换同型号化霜温度传感器
English
Meaning
Outdoor unit defrost temperature sensor open or short circuit. Affects defrost cycle operation.
Common Causes
- Loose or poor contact of the defrost sensor connector
- Open or short circuit failure of the sensor itself
- Sensor wiring degraded from prolonged outdoor UV exposure
- Probe detached from the outdoor heat exchanger causing inaccurate readings
- Mismatched defrost sensor model (different resistance-temperature characteristics)
Self-Check Steps
- Power off and reseat the outdoor unit defrost sensor connector
- Measure sensor resistance with a multimeter; resistance should rise significantly at low temperatures
- Verify the sensor probe is securely attached to the heat exchanger coil
- Observe whether the sensor resistance changes appropriately during the defrost cycle
- Replace with the correct defrost temperature sensor if resistance readings are abnormal