中文
含义
8H 表示主控板检测到浊度传感器故障或信号异常。通用电气部分中高端洗碗机在集水槽侧壁安装有光学浊度传感器（由红外 LED 和光电接收管组成），用于实时检测循环水的浑浊程度。主控板根据浊度传感器的反馈自动调整程序参数——如延长或缩短洗涤及漂洗时间、自动追加漂洗次数（AutoSense/Smart Dispense 功能依赖此传感器）。当传感器信号一直为零（LED 不亮）、持续饱和（接收管短路或积垢）或读数不随洗涤进程变化时，系统判定浊度传感器异常，显示 8H 代码。此时洗碗机仍可运行，但会退化为固定程序模式，自动优化功能失效。
常见原因
- 浊度传感器测量窗口（发光面和接收面）内壁被油膜、水垢或洗涤剂残留覆膜，光线被散射吸收，传感器始终输出高浊度值或零值。
- 传感器密封失效，内部进水导致 LED 或光电接收管引脚腐蚀、电路板短路，传感器无信号输出。
- 传感器线束连接器插头因振动松脱或因湿气进入氧化，主控板与传感器之间的通信中断。
- 红外 LED 长期工作后光衰严重（尤其高温高湿环境下加速老化），发射光强不足导致接收管信号微弱。
- 集水槽长期未清理，槽底沉积的厚重泥浆层将传感器测量窗口完全掩埋，光线无法透过水样。
自助排查
- 彻底清洁集水槽和过滤系统：取下并清洗所有过滤网和过滤板，用湿布擦洗集水槽内壁，特别注意浊度传感器安装位置周边（通常为集水槽侧壁上的透明小窗口）。
- 找到浊度传感器窗口（两个透明圆形小窗，一为发射端一为接收端，通常相邻排列），用软布或棉签蘸少许白醋轻轻擦拭窗口表面，去除水垢和油膜。
- 断电后拆下下前面板，顺着集水槽侧壁找到浊度传感器线束，检查插头是否插紧以及插座是否有氧化迹象；拔下后如有绿色铜锈需用接点清洁剂处理。
- 手动运行一个空载的高温洗涤程序（不放餐具，加入洗碗机清洁剂）：高温水流可帮助溶解传感器窗口上的油垢，程序结束后观察 8H 是否清除。
- 如以上步骤无效，浊度传感器大概率已内部损坏，因其为密封组件无法自行拆修，需联系通用电气售后更换浊度传感器总成。
English
Meaning
8H indicates that the main control board has detected a turbidity sensor fault or abnormal signal. Select mid-range and premium GE dishwashers are equipped with an optical turbidity sensor (consisting of an infrared LED and a photodiode receiver) mounted on the sump wall to monitor the turbidity of the circulating water in real time. The control board uses the turbidity sensor feedback to automatically adjust program parameters — such as extending or shortening wash and rinse times, and adding extra rinse cycles (features like AutoSense / Smart Dispense depend on this sensor). When the sensor signal remains at zero (LED not lit), is continuously saturated (receiver shorted or heavily fouled), or the reading does not change as the wash progresses, the system identifies a turbidity sensor anomaly and displays code 8H. The dishwasher will still operate but will fall back to a fixed program mode, and the auto-optimization features will be disabled.
Common Causes
- The turbidity sensor measurement windows (the emitter and receiver surfaces) are coated internally with a film of oil, scale, or detergent residue; the light is scattered and absorbed, causing the sensor to continuously output a high-turbidity value or a zero reading.
- The sensor seal has failed, allowing internal water ingress that corrodes the LED or photodiode pins and shorts the circuit board; the sensor outputs no signal.
- The sensor wiring harness connector plug has loosened due to vibration or suffered moisture ingress and oxidation; communication between the control board and sensor is interrupted.
- The infrared LED has suffered significant luminous decay after long-term operation (accelerated in high-temperature, high-humidity environments); the emitted light intensity is too weak, resulting in a faint receiver signal.
- The sump has not been cleaned for a long period, and the thick layer of sludge accumulated at the bottom completely buries the sensor measurement window; light cannot pass through the water sample.
Self-Check Steps
- Thoroughly clean the sump and filter system: remove and clean all filter screens and the filter plate; scrub the sump interior walls with a damp cloth, paying particular attention to the area around the turbidity sensor mounting point (typically a small transparent window on the sump side wall).
- Locate the turbidity sensor windows (two small transparent round windows, one emitter and one receiver, typically positioned adjacent to each other), and gently wipe the window surfaces with a soft cloth or cotton swab moistened with a small amount of white vinegar to remove scale and oil film.
- With power disconnected, remove the lower front panel, trace the turbidity sensor wiring harness along the sump wall, check that the plug is firmly seated and the socket shows no signs of oxidation. Unplug and if green copper corrosion is present, treat with electrical contact cleaner.
- Run an empty high-temperature wash cycle manually (no dishes, add dishwasher cleaner): the high-temperature water flow can help dissolve oil buildup on the sensor windows. After the cycle completes, observe whether code 8H has cleared.
- If the above steps are ineffective, the turbidity sensor has most likely suffered internal damage; as it is a sealed assembly that cannot be serviced by the user, contact GE after-sales service to replace the turbidity sensor assembly.