中文
含义
PrS（Pressure Sensor）表示主控板检测到水槽水位压力传感器信号异常。通用电气洗碗机使用气压式水位检测系统：集水槽底部连接一根细气管到压力传感器（水位压力开关），水槽内水位上升时气管内气压升高，压力传感器膜片变形驱动内部开关触点动作或多级电阻输出的电子压力传感模块，主控板据此判断当前水位。当主控板检测到压力信号值与已知状态不匹配（例如排水阶段仍报高水位、连续报多个不可实现的水位值，或传感器输出电压超出正常范围），系统判定压力传感器故障，显示 PrS 代码。
常见原因
- 压力传感气管从集水槽底部接口脱落或接口龟裂漏气，水位变化无法产生气压变化传递到传感器，传感器输出电压或开关状态恒定不变。
- 压力传感气管内部被油脂、食物残渣泥浆或霉菌堵死，气压无法传导至传感器膜片，形成”死气室”效应。
- 压力传感气管弯折或被周围管线压住，气流通道被截断。
- 电子式压力传感器（带电路板的新一代型号）受潮后内部电路损坏，输出电压漂移或恒定为零/满量程。
- 机械式压力开关触点氧化或膜片疲劳破裂，开关长期保持闭合或断开状态不随压力变化。
- 压力传感器至主控板的线束连接端子松脱或氧化，信号电压被分压或中断。
自助排查
- 将洗碗机断电拔插头，等待 5 分钟让主控板完全复位。重新通电后启动短程序，运行一个完整周期，观察 PrS 代码是否复现（偶发性 PrS 可能因气管内冷凝水暂时堵塞，热机后蒸发可自愈）。
- 断电后拆下下前面板，顺集水槽底部找到一根连接到压力传感器的细透明或半透明塑料气管（通常直径约 4-6 mm）。整段检查气管是否有明显弯折、压扁、脱落或断裂。
- 从压力传感器端拔下气管，用嘴轻轻向气管内吹气，同时用手在集水槽端感受是否有气流出：若无气流，说明气管内部堵塞需更换或疏通；切勿用高压气泵吹气以防损坏传感器膜片。
- 检查压力传感器本体（通常安装在水槽外侧壁偏高处，远离积水位置）是否有水渍、锈蚀或外壳开裂痕迹：电子压力传感器对湿气敏感，一旦进水通常需要更换。
- 拔下压力传感器线束插头，检查端子是否有氧化发黑现象：如有，用接点清洁剂处理；检查插头防水密封圈是否老化缺失。
- 若气管通畅、传感器外观正常、端子清洁且 PrS 仍持续报错，需用万用表测量传感器工作电压和信号输出是否在规格范围内。若超出规格范围，压力传感器已损坏需更换总成，联系通用电气售后。
English
Meaning
PrS (Pressure Sensor) indicates that the main control board has detected an abnormal signal from the tub water level pressure sensor. GE dishwashers use a pneumatic water level detection system: a small air hose connects from the bottom of the sump to a pressure sensor (water level pressure switch). As the tub water level rises, air pressure in the hose increases, causing the pressure sensor diaphragm to deform and either actuate internal switch contacts (mechanical type) or produce a multi-level resistance/voltage output (electronic pressure sensor module); the control board determines the current water level based on this signal. When the control board detects that the pressure signal value is inconsistent with the known state (e.g., reporting high water level during the drain phase, consecutively reporting impossible water level values, or sensor output voltage outside the normal range), the system identifies a pressure sensor fault and displays code PrS.
Common Causes
- The pressure-sensing air hose has come off the sump bottom nipple, or the nipple has cracked and is leaking air; water level changes cannot produce air pressure changes to reach the sensor, and the sensor output voltage or switch state remains constant.
- The pressure-sensing air hose is internally clogged with grease, food-debris sludge, or mold; air pressure cannot reach the sensor diaphragm, creating a “dead air chamber” effect.
- The pressure-sensing air hose is kinked or pinched by surrounding wiring or plumbing, cutting off the air passage.
- An electronic pressure sensor (newer-generation type with an onboard circuit board) has suffered moisture damage internally; the output voltage drifts or is stuck at zero or full-scale.
- A mechanical pressure switch has oxidized contacts or a fatigued, ruptured diaphragm; the switch remains permanently closed or open regardless of pressure changes.
- The wiring harness connector terminals between the pressure sensor and the main control board are loose or oxidized; the signal voltage is divided down or interrupted.
Self-Check Steps
- Disconnect the dishwasher from power and wait 5 minutes for the control board to fully reset. Restore power, start a short cycle, and run a complete cycle while observing whether code PrS reappears. Intermittent PrS can be caused by condensation water temporarily blocking the air hose; after the machine warms up the moisture may evaporate and the issue may self-resolve.
- With power disconnected, remove the lower front panel and trace from the sump bottom to find a thin transparent or translucent plastic air hose (typically 4–6 mm diameter) connected to the pressure sensor. Inspect the entire length of the hose for noticeable kinks, flattening, detachment, or breakage.
- Disconnect the air hose from the pressure sensor end and gently blow into the hose by mouth while feeling for airflow at the sump end: no airflow indicates the hose is internally clogged and requires replacement or clearing. Never use a high-pressure air pump to blow the hose, as this can damage the sensor diaphragm.
- Inspect the pressure sensor body (typically mounted on the outer side wall of the tub at a relatively high position, away from standing water areas) for water stains, rust, or housing cracks: electronic pressure sensors are moisture-sensitive, and once water ingress occurs the sensor typically requires replacement.
- Unplug the pressure sensor wiring harness connector and inspect the terminals for black oxidation: if present, treat with contact cleaner. Check whether the connector waterproof sealing ring is aged or missing.
- If the air hose is clear, the sensor appearance is normal, the terminals are clean, and PrS continues to persist, use a multimeter to measure whether the sensor supply voltage and signal output are within the specified range. If outside the specified range, the pressure sensor has failed and the assembly must be replaced — contact GE after-sales service.