3-1 - kitchenaid Dishwasher

中文

含义

3-1 表示主控板检测到温度传感器（NTC 热敏电阻）电路开路。NTC 热敏电阻是一种负温度系数电阻，水温越高阻值越低。主控板持续向 NTC 提供基准电压并测量分压值来换算水温。当检测到的阻值异常高（接近无穷大），说明热敏电阻回路断开，主控板显示 3-1 代码，此时加热功能将被禁用以防止干烧风险。

常见原因

1. NTC 热敏电阻老化后内部断裂，电阻体开路导致主控板无法读取温度信号。
2. NTC 传感器线束插头松动、脱落或被水汽腐蚀，插接件接触不良形成开路。
3. NTC 线束在走线过程中被内胆边缘或结构件挤压割破，导线内部断裂。
4. NTC 传感器插接座在主控板一侧虚焊或焊点开裂，衔接断开。
5. 水垢在 NTC 探头表面严重积聚形成隔热层，传感器响应迟钝但在诊断模式下被判定为开路异常。
6. 主控板上温度检测电路的 ADC 通道或分压电阻损坏，误报 NTC 开路。

自助排查

1. 断开洗碗机电源 5 分钟，等待主控板完全放电后重新通电，看故障代码是否清除（排除偶发性检测误报）。
2. 找到 NTC 热敏电阻在洗碗机内的位置（通常位于内胆底部集水槽附近），目视检查传感器插头是否牢固插入插座。
3. 拔下 NTC 传感器插头，检查插头和插座金属端子是否有绿色铜锈、白色腐蚀物或水渍，如有用无水酒精擦拭干净后重新插紧。
4. 沿着 NTC 线束走线方向目视检查导线外皮是否有割伤、挤压痕迹或熔损，如发现破损说明需要更换整根线束。
5. 如条件允许，用万用表测量 NTC 两端电阻值：室温（约 25°C）下应在 10kΩ–50kΩ 范围内；如读数为无穷大（OL），证实热敏电阻已开路，需更换 NTC 传感器。
6. 若插头、线束和 NTC 本体均正常但故障依旧，说明主控板温度检测电路故障，需联系凯膳怡售后更换主控板。

English

Meaning

3-1 indicates that the main control board has detected an open circuit in the temperature sensor (NTC thermistor). An NTC thermistor is a negative temperature coefficient resistor — the higher the water temperature, the lower its resistance. The control board continuously supplies a reference voltage to the NTC and measures the divided voltage to calculate water temperature. When the detected resistance is abnormally high (near infinite), indicating the thermistor loop is broken, the control board displays code 3-1 and disables the heating function to prevent a dry-heating hazard.

Common Causes

1. The NTC thermistor has aged and fractured internally; the open-circuit element prevents the control board from reading a temperature signal.
2. The NTC sensor wiring harness connector is loose, dislodged, or corroded by moisture, causing intermittent or open-circuit contact.
3. The NTC wiring harness has been pinched or cut by the tub edge or structural components during routing, with an internal wire break.
4. The NTC sensor connector socket on the main control board side has a cold solder joint or cracked solder pad, breaking the connection.
5. Heavy scale buildup on the NTC probe surface forms an insulating layer; the sensor response is sluggish but the diagnostic mode may classify it as an open-circuit anomaly.
6. The ADC channel or voltage divider resistor in the temperature detection circuit on the main control board has failed, falsely reporting an NTC open circuit.

Self-Check Steps

1. Disconnect power for 5 minutes to allow the main control board to fully discharge; reconnect power and check if the fault code clears (ruling out a transient detection glitch).
2. Locate the NTC thermistor inside the dishwasher (typically near the sump area at the bottom of the tub) and visually check that the sensor connector is firmly seated in its socket.
3. Disconnect the NTC sensor plug and inspect the metal terminals on both the plug and socket for green copper corrosion, white oxidation, or water stains; clean with anhydrous alcohol if found, then reconnect firmly.
4. Visually trace the NTC wiring harness along its routing path for cuts, crush marks, or melted insulation on the wire jacket; any visible damage indicates the entire harness needs replacement.
5. If available, use a multimeter to measure the resistance across the NTC terminals: at room temperature (approx. 25°C), the reading should fall within 10kΩ–50kΩ; a reading of infinite resistance (OL) confirms the thermistor is open and the NTC sensor must be replaced.
6. If the connector, harness, and NTC body are all intact but the fault persists, the temperature detection circuit on the main control board has failed — contact KitchenAid after-sales service for control board replacement.