中文
含义
3-1 表示洗碗机的 NTC 温度传感器（负温度系数热敏电阻）检测到开路状态。肯摩尔洗碗机在加热器腔体或内胆水路中安装有 NTC 热敏电阻，用于实时监测水温，主控板根据水温数据精确控制加热元件的工作周期，以确保洗涤温度（通常 50-65 °C）和漂洗温度（通常 65-75 °C）达标。当控制板检测到 NTC 回路电阻无穷大（开路）时，系统无法获取有效温度读数，即显示 3-1 错误代码。在此状态下，洗碗机可能会跳过加热环节继续用冷水运行，或暂停程序等待故障排除。
常见原因
- NTC 热敏电阻的连接器松动或脱落，插头与插座之间接触不良。
- NTC 传感器线束被洗碗机内部高温蒸汽长期影响，绝缘层老化开裂导致导线断裂。
- NTC 热敏电阻本体损坏，内部半导体晶片因潮气渗入、机械应力或老化而开裂。
- 传感器引脚与线束压接端子氧化腐蚀，接触电阻异常升高。
- 主控板上 NTC 信号的输入引脚虚焊或电路板走线断裂。
- 拆装其他部件时不小心拉扯到 NTC 线束，导致线束内部铜丝断裂但外皮尚完整。
- 温度传感器密封圈失效，水汽渗入传感器内部造成腐蚀性断路。
自助排查
- 断开洗碗机电源，等待至少 5 分钟让内部电容完全放电后再进行检修操作。
- 根据用户手册或维修图纸找到 NTC 热敏电阻的位置（通常在加热器组件旁边或内胆底部水槽区域）。
- 检查 NTC 传感器的电连接器是否完全插入到位，尝试拔下插头并重新插紧，确认有清脆的”咔哒”锁定声。
- 目视检查 NTC 线束整段线路，看是否有明显的烫伤痕迹、绝缘皮破损或折痕，尤其关注经过加热元件附近的区段。
- 用万用表欧姆挡测量 NTC 传感器两端引脚之间的电阻值：室温（~25 °C）下正常值约为 10-12 kΩ，如果测得无穷大则传感器本体已开路损坏。
- 轻微摆动线束靠近连接器根部位置，同时观察万用表读数是否跳动变化，若读数时有时无，说明导线在绝缘层内部已有断裂。
- 若 NTC 本身测量正常但故障依旧，则问题可能在主控板的温度检测电路，需联系肯摩尔售后更换主板或做进一步诊断。
English
Meaning
3-1 indicates that the dishwasher’s NTC temperature sensor (Negative Temperature Coefficient thermistor) is detected as open circuit. Kenmore dishwashers have an NTC thermistor installed in the heater chamber or the tub’s water pathway to monitor water temperature in real time. The main control board relies on this temperature data to precisely control the heating element’s duty cycle, ensuring the wash temperature (typically 50–65 °C) and rinse temperature (typically 65–75 °C) meet specifications. When the control board detects infinite resistance (open circuit) on the NTC loop, the system cannot obtain a valid temperature reading and displays the 3-1 error code. In this state, the dishwasher may skip the heating phase and continue running with cold water, or pause the program until the fault is resolved.
Common Causes
- The NTC thermistor’s connector is loose or has come unplugged, causing poor contact between the plug and receptacle.
- The NTC sensor wiring harness has been affected by prolonged exposure to high-temperature steam inside the dishwasher, causing the insulation to age, crack, and the conductor to break.
- The NTC thermistor body is damaged — the internal semiconductor chip has cracked due to moisture ingress, mechanical stress, or aging.
- The sensor pins and the wiring harness crimp terminals are oxidized or corroded, causing abnormally high contact resistance.
- The NTC signal input pin on the main control board has a cold solder joint or the PCB trace is broken.
- The NTC wiring harness was accidentally pulled during disassembly of other components, causing internal copper wire breakage while the outer jacket still appears intact.
- The temperature sensor’s sealing gasket has failed, allowing moisture to enter the sensor body and cause corrosive open circuit.
Self-Check Steps
- Disconnect the dishwasher from the power supply and wait at least 5 minutes for the internal capacitors to fully discharge before performing any inspection.
- Refer to the user manual or service diagram to locate the NTC thermistor (typically positioned next to the heater assembly or in the bottom sump area of the tub).
- Check whether the NTC sensor’s electrical connector is fully seated. Try unplugging and re-plugging the connector, confirming a crisp “click” locking sound.
- Visually inspect the entire length of the NTC wiring harness for obvious scorch marks, insulation damage, or creases, paying special attention to sections that pass near the heating element.
- Use a multimeter in ohms mode to measure the resistance across the two NTC sensor pins: the normal value at room temperature (~25 °C) is approximately 10–12 kΩ; an infinite reading indicates the sensor body itself is open and damaged.
- Gently wiggle the wiring harness near the connector root while observing the multimeter reading for fluctuations. If the reading comes and goes, the conductor is fractured inside the insulation.
- If the NTC itself measures normal but the fault persists, the issue likely lies in the main control board’s temperature detection circuit. Contact Kenmore after-sales service for a board replacement or further diagnosis.