中文
含义
微波炉温度传感器故障。E4 表示主控芯片检测到炉腔温度传感器（通常用于烧烤模式或过热保护的 NTC 热敏电阻）阻值异常——开路或短路。
常见原因
- 温度传感器 NTC 热敏电阻开路或短路损坏
- 传感器引线在炉腔顶部高温区域绝缘老化短路
- 传感器连接器松动或氧化接触不良
- 传感器安装位置偏移，未正确插入检测孔
- 主控板温度检测回路中电阻或电容损坏
- 烧烤模式下传感器长期承受高温导致性能劣化
自助排查
- 断电重启：拔掉电源插头等待 5 分钟，重新插电观察是否恢复
- 检查连接器：打开微波炉外壳，找到温度传感器在主控板上的插头（通常标记为 T-SENSOR 或 RT），重新插拔
- 测量传感器：用万用表电阻档测量传感器两端，常温下正常值约 10kΩ-100kΩ；无穷大为开路，接近 0Ω 为短路
- 检查引线：目视传感器引线特别是靠近炉腔部分是否有绝缘破损或烤焦
- 呼叫售后：若传感器损坏需更换原厂温度传感器，联系 Robam 售后（9510-5855）
English
Meaning
Microwave temperature sensor fault. E4 indicates the main control chip detects abnormal resistance from the cavity temperature sensor (NTC thermistor, used for grill mode or overheat protection) — either open or short circuit.
Common Causes
- Open or shorted NTC thermistor in the temperature sensor
- Sensor lead insulation degraded and shorted near the high-temperature cavity top area
- Loose or oxidized sensor connector causing poor contact
- Sensor mounting displaced, not properly inserted into the detection hole
- Damaged resistor or capacitor in the main board temperature detection circuit
- Sensor performance degraded from prolonged exposure to high temperature in grill mode
Self-Check Steps
- Power cycle: Unplug the microwave for 5 minutes, then reconnect to see if the code clears
- Check connector: Open the microwave housing, locate the temperature sensor connector on the main board (usually marked T-SENSOR or RT), and reseat it
- Measure sensor: Use a multimeter in resistance mode across the sensor. Normal room-temperature reading is 10kΩ-100kΩ; infinite indicates open circuit, near 0Ω indicates short
- Inspect leads: Visually check sensor leads, especially near the cavity area, for insulation damage or burn marks
- Call support: If the sensor is damaged, replace with an original Robam temperature sensor. Contact after-sales service (9510-5855)