中文
含义
F4 表示烤箱温度传感器回路短路，控制板检测到的传感器电压异常偏低。温度传感器为 NTC 热敏电阻，正常工作时阻值随温度升高而降低。当传感器两端线束意外短接、传感器内部击穿或控制板检测电路故障时，控制板读到的阻值趋近于零（对应极高温度读数），触发短路保护。烤箱将立即停止加热并显示 F4。
常见原因
- 传感器引出线的绝缘层在高温区域熔化，两股导线铜芯裸露并接触短路。
- 传感器探头本体受到机械撞击导致内部热敏元件击穿短路。
- 传感器线束在穿过烤箱金属隔板时未加护套保护，金属边缘割破绝缘层造成对地短路。
- 控制板上的传感器接口保护元件（如 TVS 二极管）击穿短路。
- 清洗烤箱时水或清洁剂沿传感器探头渗入内部，造成元件短路。
自助排查
- 断开烤箱电源。从烤箱腔内找到温度传感器探头（后壁中上部金属凸起）。
- 检查传感器探头周围是否有液体渗透的痕迹或清洁剂残留。
- 从背面检修面板找到传感器与控制板的连接插头，拔下后用万用表欧姆档测量传感器两端引线之间阻值。室温下应为约 1080 Ω；若读数接近 0 Ω，确认传感器或线束短路。
- 仔细检查从传感器探头到控制板插头的整段线束，特别关注线束穿过金属孔的位置，查找绝缘破损点。
- 若传感器及线束均正常，故障可能在控制板输入端。联系 GE 售后技术人员使用替换控制板进行交叉验证。更换传感器时建议同时更换线束组件。
English
Meaning
F4 indicates a short circuit in the oven temperature sensor loop — the voltage detected by the control board is abnormally low. The temperature sensor is an NTC thermistor whose resistance decreases as temperature rises. When the two sensor leads are accidentally shorted together, the sensor element is internally broken down, or the control board sensing circuit is faulty, the control board reads a near-zero resistance (corresponding to an extremely high temperature reading) and triggers short-circuit protection. The oven immediately stops heating and displays F4.
Common Causes
- The insulation on the sensor lead wires has melted in a high-temperature zone, exposing the copper conductors which touch and short together.
- The sensor probe body has suffered mechanical impact, causing internal breakdown and shorting of the thermistor element.
- The sensor wiring harness passes through a metal bulkhead without a protective grommet; the sharp metal edge cuts through the insulation and causes a short to ground.
- The protection component on the control board’s sensor input (e.g., a TVS diode) has failed short.
- Water or cleaning agents have seeped along the sensor probe during oven cleaning and penetrated the sensor body, shorting the internal element.
Self-Check Steps
- Disconnect oven power. Locate the temperature sensor probe inside the oven cavity (metal protrusion on the upper-middle rear wall).
- Check around the sensor probe for signs of liquid seepage or cleaning-product residue.
- From the rear access panel, find the sensor connector at the control board, unplug it, and measure the resistance between the two sensor leads with a multimeter on the ohms range. At room temperature it should be approximately 1080 Ω; a reading close to 0 Ω confirms a short in the sensor or harness.
- Carefully inspect the entire wiring harness from the sensor probe to the control board connector, paying special attention to where the harness passes through metal holes — look for insulation damage.
- If both the sensor and harness are intact, the fault may be on the control board input side. Contact GE service to cross-validate with a replacement control board. When replacing the sensor, replacing the harness assembly at the same time is recommended.