E4 - tcl Refrigerator

中文

含义

冰箱化霜传感器故障。E4 表示化霜温度传感器（检测蒸发器表面温度的传感器）检测回路异常。化霜传感器用于判断化霜是否已完成，故障可能导致化霜时间不受控——化霜不足导致蒸发器结冰影响制冷，或化霜过度导致冷藏室温度升高。

常见原因

1. 化霜温度传感器（通常紧贴冷冻室蒸发器盘管）损坏，阻值异常。
2. 传感器探头脱离蒸发器固定位置，无法准确感知盘管温度。
3. 传感器连接线在化霜加热器附近被高温烤化绝缘层。
4. 传感器插头接触不良或腐蚀。
5. 化霜传感器与冷冻室温度传感器混淆插反，系统读取错误。
6. 主板化霜传感器检测电路故障。

自助排查

1. 断电后进行彻底化霜（打开冷冻室门 24 小时，让所有霜层完全融化），然后重新通电。
2. 化霜后找到蒸发器上的化霜传感器探头，确保其紧密固定在蒸发器盘管上。
3. 检查传感器导线绝缘是否有被加热管烤熔的痕迹——如有需更换传感器并远离加热管布线。
4. 用万用表测量传感器阻值，0°C 时约 20kΩ–30kΩ。若 0Ω 或无穷大需更换。
5. 化霜传感器故障可能导致蒸发器严重结冰，若化霜后仍频繁 E4，联系 TCL 售后更换传感器。

English

Meaning

The defrost sensor has failed. E4 indicates the defrost temperature sensor (which detects the evaporator surface temperature) detection loop is abnormal. The defrost sensor determines whether defrosting is complete. A fault may lead to uncontrolled defrost duration — insufficient defrost causes evaporator icing affecting cooling, or excessive defrost raises the fresh food compartment temperature.

Common Causes

1. The defrost temperature sensor (typically attached to the freezer evaporator coil) is damaged — abnormal resistance.
2. The sensor probe has detached from its fixed position on the evaporator and cannot accurately sense coil temperature.
3. The sensor wire insulation has been melted by high temperature near the defrost heater.
4. The sensor connector has poor contact or corrosion.
5. The defrost sensor and freezer sensor are plugged into the wrong sockets, and the board reads incorrect data.
6. The defrost sensor detection circuit on the main board is faulty.

Self-Check Steps

1. After powering off, perform a full defrost (open the freezer door for 24 hours to allow all frost to completely melt), then power on again.
2. After defrosting, locate the defrost sensor probe on the evaporator and ensure it is tightly secured to the evaporator coil.
3. Check whether the sensor wire insulation shows signs of melting from the heater tube — if so, replace the sensor and route it away from the heater.
4. Use a multimeter to measure sensor resistance; at 0°C it should be approximately 20kΩ–30kΩ. Replace if 0Ω or infinite.
5. A defrost sensor fault may cause severe evaporator icing. If E4 persists after defrosting, contact TCL after-sales to replace the sensor.