E21 - 富及第 烘干机

中文

含义

E21 故障代码表示干衣机的温度传感器（热敏电阻）电路出现开路或短路故障。控制系统检测到温度信号异常，无法准确读取滚筒内部温度，因此自动停止加热并终止运行以防止过热风险。此代码通常在启动后几分钟内触发，传感器电阻值超出正常范围（通常在 10kΩ–50kΩ 之间）。

常见原因

1. 温度传感器（热敏电阻）内部开路或短路，电阻值异常。
2. 传感器连接器松动、氧化或插针弯曲，导致接触不良。
3. 传感器到主控板之间的线束破损、断裂或绝缘层磨损。
4. 主控板温度检测电路元件（分压电阻、电容）损坏。
5. 传感器安装位置移位或脱落，无法接触热风道气流。

自助排查

1. 断开电源，拔下温度传感器连接器，用万用表测量传感器两端电阻值；室温下正常值约为 10kΩ–15kΩ，若为无穷大或零则传感器损坏。
2. 检查连接器插针是否有氧化、腐蚀或变形，用电子清洁剂喷洗后重新插紧。
3. 沿传感器线束目视检查是否有破损、断裂或烫伤痕迹，必要时用万用表通断档测试线路连续性。
4. 若传感器和线路均正常，测试主控板传感器接口处的参考电压（应为 5V DC），电压异常表明主控板故障。
5. 重新安装传感器，确保其紧贴排风道壁且固定卡扣到位，避免震动脱落。

English

Meaning

Error code E21 indicates an open or short circuit in the dryer’s temperature sensor (thermistor) circuit. The control board detects an abnormal temperature signal and cannot accurately read the drum temperature, so it halts the heating cycle and terminates operation to prevent overheating. This code typically triggers within a few minutes of startup when the sensor resistance falls outside the normal range (10kΩ–50kΩ).

Common Causes

1. Temperature sensor (thermistor) internally open or shorted, producing out-of-range resistance readings.
2. Sensor connector loose, corroded, or with bent pins causing intermittent contact.
3. Wiring harness between sensor and main control board chafed, broken, or with damaged insulation.
4. Main control board temperature sensing circuit components (divider resistors, capacitors) failed.
5. Sensor dislodged from its mounting position, no longer exposed to exhaust airflow.

Self-Check Steps

1. Disconnect power, unplug the temperature sensor connector, and measure resistance across the sensor terminals with a multimeter — normal reading at room temperature is 10kΩ–15kΩ; infinity or zero indicates a faulty sensor.
2. Inspect connector pins for oxidation, corrosion, or deformation; clean with electronic contact cleaner and reseat firmly.
3. Visually trace the sensor wiring harness for chafing, breaks, or burn marks; use a multimeter continuity test to check for breaks.
4. If sensor and wiring check out, test the reference voltage (5V DC) at the sensor connector on the control board side — abnormal voltage suggests a board fault.
5. Reinstall the sensor securely against the exhaust duct wall, ensuring the retaining clip is engaged to prevent vibration-induced loosening.