F3 - 通用电气 烤箱

中文

含义

F3 表示烤箱温度传感器回路开路，控制板检测不到传感器信号。烤箱温度传感器是一个负温度系数（NTC）热敏电阻，安装在烤箱后壁内侧。控制板通过分压电路持续监测传感器两端电压：当回路完全断开时，控制板检测到的电压超出正常范围，判定为开路故障。此故障下烤箱无法获知腔体温度，加热功能被禁用以防止失控。

常见原因

1. 温度传感器线束插头从控制板插座松脱，回路物理断开。
2. 传感器内部热敏电阻元件因长期热循环老化后断裂开路。
3. 传感器引出线在烤箱内部高温区域绝缘层老化脆裂，导线折断。
4. 线束沿途被烤箱内部金属边缘割破或夹断。
5. 控制板上传感器接口插座虚焊或 PCB 走线断裂。

自助排查

1. 断开烤箱电源，找到温度传感器位置（通常在烤箱后壁中上部，从腔内可见一个直径约 6mm 的金属探头）。
2. 从背面检修面板拆下盖板，找到传感器线束与控制板的连接插头，确认插头是否牢固插入。
3. 拔下传感器插头，用万用表欧姆档测量传感器两端引线电阻。室温下正常阻值约 1080 Ω；若显示无穷大（OL），确认传感器内部开路。
4. 若传感器阻值正常，检查从传感器到控制板的整段线束，查看是否有烧焦、割伤或折痕。
5. 更换温度传感器（GE 零件号通常为 WB21X158 或对应型号）。更换时注意走线避开高温元件，并用耐高温线扎固定线束。若不熟悉拆装，联系 GE 售后更换。

English

Meaning

F3 indicates an open circuit in the oven temperature sensor loop — the control board cannot detect a sensor signal. The oven temperature sensor is a negative temperature coefficient (NTC) thermistor mounted on the inner rear wall of the oven cavity. The control board continuously monitors the voltage across the sensor through a voltage divider circuit. When the loop is completely open, the voltage detected by the control board falls outside the normal range, and an open-circuit fault is triggered. Under this fault, the oven cannot determine cavity temperature and heating is disabled to prevent runaway.

Common Causes

1. The temperature sensor wiring harness connector has come loose from the control board socket, physically breaking the circuit.
2. The thermistor element inside the sensor has fractured open after aging from long-term thermal cycling.
3. The sensor lead wire insulation has aged and cracked in the high-temperature zone inside the oven, causing the conductor to break.
4. The wiring harness has been cut or pinched by sharp metal edges along the routing path inside the oven.
5. The sensor interface socket on the control board has a cold solder joint or a broken PCB trace.

Self-Check Steps

1. Disconnect oven power. Locate the temperature sensor (typically on the upper-middle rear wall of the oven cavity, visible as a metal probe approximately 6 mm in diameter).
2. Remove the rear access panel cover and locate the sensor harness connector plugged into the control board. Confirm the connector is firmly seated.
3. Unplug the sensor connector and measure the resistance across the two sensor leads with a multimeter on the ohms range. At room temperature, the normal value is approximately 1080 Ω; an infinite (OL) reading confirms an open sensor.
4. If the sensor resistance is normal, inspect the entire wiring harness from sensor to control board for burn marks, cuts, or kinks.
5. Replace the temperature sensor (GE part number typically WB21X158 or equivalent). Route the new harness away from high-temperature components and secure it with high-temperature zip ties. If you are unfamiliar with disassembly, contact GE service for replacement.