中文
含义
E70 表示 NTC 温度传感器故障。控制器检测到温度传感器（NTC 热敏电阻）信号异常——通常是传感器开路（阻值无穷大）或短路（阻值接近零），信号超出了控制器预设的有效范围。NTC 传感器故障会导致洗衣机无法准确感知水温，从而禁用所有加热程序；在某些机型中，E70 甚至会导致整个洗涤流程无法启动。
常见原因
- NTC 温度传感器本体内部热敏元件老化断裂，呈开路状态。
- NTC 传感器连接线束因高温蒸汽长期侵蚀导致绝缘层硬化、开裂，内部导线折断。
- NTC 传感器插接件受潮氧化或进水，造成端子间短路或漏电，主板检测到异常低阻值。
- NTC 传感器外壳（通常为不锈钢或铜制探头）被水垢或洗涤剂残留完全包裹，严重迟滞温度响应速度。
- 控制主板 ADC 采样电路或分压电阻异常，即使 NTC 正常也会读到错误的阻值换算结果。
自助排查
- 拔掉电源插头，打开后盖板，找到 NTC 温度传感器（通常位于外筒底部加热管附近，为两线制不锈钢探头）。
- 拔下 NTC 传感器插头，检查两端子是否有明显氧化、腐蚀或水渍，用干布或电子清洁剂擦拭干净。
- 使用万用表电阻档（若有条件）测量 NTC 两端阻值——常温下（25°C）正常约 10–50 kΩ，此时用手握住探头片刻阻值应有明显下降变化。若读数为零或无穷大，传感器已损坏。
- 检查从 NTC 传感器到主板的整条线束，特别是穿过机箱和门封位置的导线是否有磨损露铜或断裂。
- NTC 传感器为精密元件，自行更换需确保橡胶密封圈安装到位以防漏水。若无万用表或更换经验，联系富及第售后进行 NTC 传感器及主控板温度通道检测。
English
Meaning
E70 indicates an NTC temperature sensor fault. The controller has detected an abnormal signal from the temperature sensor (NTC thermistor) — typically an open circuit (infinite resistance) or short circuit (near-zero resistance), with the signal falling outside the controller’s preset valid range. An NTC sensor fault prevents the washer from accurately sensing water temperature, thereby disabling all heated programs; on some models, E70 will even prevent the entire wash cycle from starting.
Common Causes
- The thermistor element inside the NTC sensor has aged and fractured, resulting in an open-circuit condition.
- The NTC sensor wiring harness has suffered prolonged exposure to high-temperature steam, causing insulation hardening, cracking, and broken internal conductors.
- The NTC sensor connector has oxidized or been exposed to water due to moisture ingress, causing inter-terminal short or leakage current — the main board detects an abnormally low resistance.
- The NTC sensor probe casing (typically a stainless steel or copper probe) is completely coated with scale or detergent residue, severely delaying temperature response.
- The control board ADC sampling circuit or voltage-divider resistor is abnormal, causing incorrect resistance conversion readings even when the NTC itself is functional.
Self-Check Steps
- Unplug the power cord, open the rear panel, and locate the NTC temperature sensor (typically near the heating element at the bottom of the outer tub, appearing as a two-wire stainless steel probe).
- Disconnect the NTC sensor plug and inspect both terminals for visible oxidation, corrosion, or moisture. Wipe clean with a dry cloth or electronic contact cleaner.
- Using a multimeter in resistance mode (if available), measure the resistance across both NTC terminals — at room temperature (25°C / 77°F), a normal reading is approximately 10–50 kΩ. Hold the probe in your hand for a moment — the resistance should show a noticeable downward change. A reading of zero or infinite indicates a damaged sensor.
- Inspect the entire wiring harness from the NTC sensor to the main board, paying special attention to wires passing through chassis openings and the door seal area for worn, exposed, or broken conductors.
- The NTC sensor is a precision component. If replacing it yourself, ensure the rubber sealing gasket is properly seated to prevent water leaks. If you lack a multimeter or replacement experience, contact Frigidaire after-sales service for NTC sensor and control board temperature channel diagnostics.