中文
含义
4-2 表示循环泵（洗涤泵）运行异常。循环泵负责将集水槽中的水加压输送至上下喷淋臂，是洗碗机洗涤功能的水力核心。主控板通过电流检测或霍尔传感器监控循环泵的运转状态，当检测到泵体过流、欠流、堵转或转速偏差过大时，显示 4-2 代码并终止洗涤程序，防止电机进一步损坏或引发电气安全事故。
常见原因
- 循环泵叶轮被异物（碎玻璃、牙签、标签纸、鸡骨碎片）缠绕或卡死，电机无法带动叶轮旋转。
- 循环泵机械密封（水封）损坏，水渗漏进入电机腔体导致轴承生锈抱死。
- 循环泵电机绕组因长期高负荷运行过热老化，匝间绝缘击穿导致短路或断路。
- 洗涤水中有大量泡沫或使用了非低泡洗涤剂，泵叶轮发生气蚀导致转速异常波动触发保护。
- 循环泵供电线束端子因震动松动或电弧烧蚀，接触电阻增大导致泵供电电压不足。
- 主控板循环泵驱动电路 MOSFET 或继电器过流击穿，无法正常输出 PWM 驱动信号。
- 循环泵内部霍尔传感器磁环脱落或电路板受潮，反馈转速信号丢失。
自助排查
- 切断洗碗机电源，拆下底部过滤网和集水槽盖板，用手电筒照明检查循环泵入口叶轮是否有异物缠绕，如有用尖嘴钳小心取出。
- 用手轻轻拨动叶轮，感受转动是否顺滑；如有明显的卡顿、咯吱声或旋转阻力过大，说明轴承或水封已损坏。
- 检查集水槽底部是否有油状液体（水封泄漏的标志），以及电机外壳下方是否有水渍或锈迹，这些表明水封已失效。
- 闻一下泵体区域是否有绝缘漆烧焦的刺鼻气味，如有说明电机绕组已过热烧毁。
- 检查循环泵的供电线束插头是否完全插紧，插头塑料外壳是否有熔化或变色迹象。
- 重新安装过滤网和盖板，启动一个短洗涤程序，在洗涤阶段将耳朵贴近洗碗机门听循环泵是否有持续的运转声；若有间歇启停或异常噪音，说明泵或驱动电路故障，需联系凯膳怡售后检修。
English
Meaning
4-2 indicates abnormal operation of the circulation pump (wash pump). The circulation pump is responsible for pressurizing water from the sump and delivering it to the upper and lower spray arms — it is the hydraulic heart of the dishwasher’s wash function. The main control board monitors the circulation pump’s running state through current sensing or Hall-effect sensors. When it detects overcurrent, undercurrent, stall, or excessive speed deviation, it displays code 4-2 and terminates the wash cycle to prevent further motor damage or electrical safety hazards.
Common Causes
- The circulation pump impeller is jammed or entangled with foreign objects (broken glass, toothpicks, label paper, chicken bone fragments), preventing the motor from turning the impeller.
- The circulation pump mechanical seal (water seal) has failed, allowing water to leak into the motor housing and causing bearing rust and seizure.
- The circulation pump motor windings have aged and overheated from prolonged high-load operation; inter-turn insulation breakdown has caused a short or open circuit.
- Excessive foam in the wash water or use of non-low-foam detergent has caused cavitation in the pump impeller, leading to abnormal speed fluctuations that trigger protection.
- The circulation pump power supply harness terminal is loose from vibration or has arc-burned contacts; increased contact resistance results in insufficient supply voltage to the pump.
- The circulation pump drive circuit MOSFET or relay on the main control board has failed from overcurrent and cannot output the normal PWM drive signal.
- The internal Hall-effect sensor magnetic ring in the circulation pump has detached, or the sensor circuit board is moisture-damaged, causing loss of the speed feedback signal.
Self-Check Steps
- Disconnect power, remove the bottom filter assembly and sump cover plate, and use a flashlight to inspect the circulation pump inlet impeller for entangled debris; carefully extract any foreign material with needle-nose pliers.
- Gently wiggle the impeller by hand and feel whether it rotates smoothly; noticeable binding, grinding sounds, or excessive rotational resistance indicates damaged bearings or a failed water seal.
- Check the bottom of the sump area for oily liquid (a sign of water seal leakage) and look beneath the motor housing for water stains or rust — these indicate the water seal has failed.
- Smell around the pump body for a pungent burnt-insulation odor; if present, it indicates the motor windings have overheated and burned out.
- Verify that the circulation pump’s power supply harness connector is fully seated, and check the connector’s plastic housing for any melting or discoloration.
- Reinstall the filter assembly and cover plate, start a short wash cycle, and during the wash phase place your ear near the dishwasher door to listen for continuous pump running noise; intermittent start-stop or abnormal noise indicates a pump or drive circuit fault — contact KitchenAid after-sales service for inspection and repair.