中文
含义
LF（Long Fill）表示洗衣机进水速度过慢，在规定时间内未能达到目标水位。与 F8E1（完全不进水）不同，LF 表示有水进入但流量远低于正常水平，通常是因为供水管路存在部分堵塞或水压偏低。控制板监测到进水阀开启后，通过水位传感器检测水位上升速率，若在预设的最大进水时间内水位仍未达到设定值，则触发 LF 报警。机器不会立即停机，而是继续尝试进水并从显示屏提示用户。
常见原因
- 自来水供水压力过低（低于 0.03 MPa），常见于高层住宅用水高峰期、老旧小区或家中同时开启多个用水设备。
- 进水阀入口滤网部分堵塞，经长期使用后泥沙和水垢积聚在滤网表面，过水面积减小导致流量下降。
- 水龙头出水口滤网或防溅器被水垢堵住大半，限制了进水流量。
- 进水软管内部扭曲、被重物压住或管壁老化内层鼓包脱层，形成”活瓣”效应部分阻塞水流。
- 进水电磁阀内部阀芯密封垫老化膨胀，阀门开启行程不足，无法全开。
- 进水软管使用了过长的延长管（超过 3 米），增加了水流沿程阻力导致流量衰减。
自助排查
- 将家中多个水龙头同时打开，观察水流大小。如果所有出水点水压都明显偏小，则属于外部供水压力问题，可联系物业或水务公司询问当前供水状况。
- 关闭水龙头，拧下进水管，清洗水龙头端和洗衣机进水阀端的滤网。用旧牙刷刷掉表面水垢和泥沙，确认滤网孔径通透。
- 直接拧下水龙头的出水嘴（防溅器/起泡器），清理内部积存的水垢和颗粒物。防溅器是最容易被忽略的流量瓶颈点。
- 检查整个进水管路有无被家具、洗衣机本身压住或过度弯折。更换为洗衣机原配标准长度进水管（通常 1.5 米），避免使用多段拼接延长管。
- 用一个 10 升水桶测试水龙头实际流量：打开冷水龙头至最大，计时看在 30 秒内能否接满半桶（约 5 升）。如果远远达不到，说明水源侧流量不足。
- 如果水源侧流量正常但进入洗衣机的实际进水量仍很小，可能是进水阀本身故障。进水阀内部堵塞无法由用户自行拆解清洗，需要联系售后更换进水阀。
- 部分机型可以通过维修模式进入工程菜单查看进水流量计读数，对比正常值判断是水压问题还是阀门/管路问题。若不确定操作方法，请咨询肯摩尔售后指导。
English
Meaning
LF (Long Fill) indicates that the washer’s water intake speed is too slow and the target water level cannot be reached within the specified time. Unlike F8E1 (no fill at all), LF means water is entering but the flow rate is significantly below normal, usually due to a partial blockage in the supply line or low water pressure. The control board monitors the water level rise rate via the water level sensor after the inlet valve opens. If the water level still fails to reach the set point within the maximum fill time, an LF alert is triggered. The machine does not immediately shut down but continues attempting to fill and prompts the user via the display.
Common Causes
- The tap water supply pressure is too low (below 0.03 MPa), commonly seen in high-rise buildings during peak water usage, older residential areas, or when multiple water appliances are running simultaneously.
- The inlet valve inlet screen is partially clogged — after long-term use, sediment and scale accumulate on the screen surface, reducing the effective flow area and lowering the flow rate.
- The faucet outlet screen or aerator is largely blocked by scale, restricting the inlet flow.
- The inlet hose is internally twisted, compressed by heavy objects, or the inner lining has aged, bulged, and delaminated, creating a “flapper valve” effect that partially obstructs water flow.
- The internal valve plunger sealing gasket inside the inlet solenoid valve has aged and swollen, limiting the valve opening stroke so it cannot fully open.
- An excessively long inlet hose extension (over 3 meters) has been used, increasing flow resistance along the path and causing flow attenuation.
Self-Check Steps
- Turn on multiple faucets in the home simultaneously and observe the water flow. If water pressure is noticeably low at all outlets, this is an external supply pressure issue — contact the property management or water utility to inquire about the current supply status.
- Turn off the faucet, disconnect the inlet hose, and clean the screens at both the faucet end and the washer inlet valve end. Scrub off surface scale and sediment with an old toothbrush to confirm the mesh pores are clear.
- Unscrew the faucet outlet nozzle (aerator/splash guard) and clean the accumulated scale and particles inside. The aerator is the most commonly overlooked flow bottleneck.
- Inspect the entire inlet hose path for compression by furniture, the washer body, or excessive bending. Replace with the original standard-length inlet hose (typically 1.5 meters) and avoid using multiple joined extensions.
- Test the actual faucet flow rate using a 10-liter bucket: open the cold water faucet fully and time whether roughly half a bucket (about 5 liters) can be collected in 30 seconds. If far short, the supply-side flow is insufficient.
- If the supply-side flow is normal but the actual water entering the washer remains very low, the inlet valve itself may be faulty. Internal blockages in the inlet valve cannot be disassembled and cleaned by the user — contact after-sales service for inlet valve replacement.
- Some models can enter the engineering menu via service mode to view the inlet flow meter reading, comparing against the normal value to determine whether the issue is water pressure or a valve/hose problem. If unsure how to operate this, consult Kenmore after-sales service for guidance.