中文
含义
空调室内机蒸发器盘管温度传感器故障。E2 表示室内机盘管传感器（检测蒸发器表面温度的热敏电阻）检测回路开路或短路。该传感器用于防冻结保护和制冷/制热模式切换判断，故障可能导致蒸发器结冰或制热效果差。
常见原因
- 室内盘管温度传感器热敏电阻损坏，阻值异常或完全开路/短路。
- 传感器插头松动或与主板插座接触不良。
- 传感器引线在蒸发器翅片边缘反复摩擦导致绝缘层破损后短路。
- 传感器探头从蒸发器铜管固定位置脱落，感测温度与实际盘管温度偏差过大。
- 室内机主板盘管传感器信号处理电路元件损坏。
- 蒸发器长期结霜后化霜水滴渗入传感器内部，导致传感器失效。
自助排查
- 断电后打开室内机面板，查找盘管传感器——通常为一根黑色或灰色导线，探头插入蒸发器翅片或卡在铜管弯头处。
- 检查传感器探头是否固定在蒸发器盘管上——若松动脱落，将其重新固定在原位置。
- 观察传感器导线是否有被翅片割破绝缘层的情况，若有需用绝缘胶带包裹破损处。
- 用万用表测量传感器阻值：不同温度下阻值不同，常温约 5kΩ–20kΩ（依型号而定）。若为 0Ω 或无穷大则传感器损坏。
- 传感器更换成本低且操作简单——拔掉旧传感器、插入同规格新传感器并固定探头即可。联系 TCL 售后获取原厂配件或安排上门更换。
English
Meaning
The indoor unit evaporator coil temperature sensor has failed. E2 indicates an open or short circuit in the indoor coil sensor (thermistor that detects evaporator surface temperature) detection loop. This sensor is used for anti-freeze protection and cooling/heating mode switching judgment. A fault may cause evaporator icing or poor heating performance.
Common Causes
- The indoor coil temperature sensor thermistor is damaged — abnormal resistance or fully open/shorted.
- The sensor connector is loose or has poor contact with the main board socket.
- The sensor lead wire insulation has been worn through by repeated friction against the evaporator fin edges, causing a short circuit.
- The sensor probe has fallen out of its fixed position on the evaporator copper tube, causing a large deviation between sensed and actual coil temperature.
- Signal processing circuit components for the coil sensor on the indoor main board are damaged.
- Long-term evaporator frosting followed by defrost water dripping into the sensor interior, causing sensor failure.
Self-Check Steps
- After powering off, open the indoor unit front panel and locate the coil sensor — typically a black or gray wire with the probe inserted into the evaporator fins or clipped onto a copper tube bend.
- Check whether the sensor probe is firmly attached to the evaporator coil — if loose or detached, secure it back in its original position.
- Inspect the sensor wire for cuts in the insulation caused by the evaporator fins. If found, wrap the damaged area with electrical tape.
- Use a multimeter to measure sensor resistance: values vary by temperature, approximately 5kΩ–20kΩ at room temperature (model-dependent). A reading of 0Ω or infinite means the sensor is damaged.
- Sensor replacement is low-cost and straightforward — unplug the old sensor, plug in a matching new one, and secure the probe. Contact TCL after-sales for genuine replacement parts or an on-site replacement service.