中文
含义
3-2 表示主控板检测到温度传感器（NTC 热敏电阻）电路短路。正常工作时 NTC 热敏电阻阻值随水温变化在几千欧至几十千欧之间浮动。当主控板检测到阻值异常低（接近零欧姆），说明热敏电阻回路存在短路，此时主控板显示 3-2 代码并禁用加热功能，因为主控板认定当前温度读数不可信，无法安全控制加热。
常见原因
- NTC 热敏电阻内部击穿短路，PN 结或电阻体永久性短路导致两端阻值接近零。
- NTC 传感器线束被内胆金属边缘割破绝缘层，两根导线裸露部分相互接触形成短路。
- NTC 插头座进水受潮，水渍在插针间形成低阻抗导电通路，等效于短路信号。
- NTC 热敏电阻探头密封失效，水汽渗入传感器封装内部造成内部短路。
- 主控板上 NTC 检测电路的分压电阻短路或 ADC 输入引脚因静电击穿对地短路，永久输出短路信号。
- 线束在维修过程中被螺钉或卡扣挤压，将两根导线压在一起形成短路。
自助排查
- 断开洗碗机电源，拔下 NTC 传感器在主控板端的插头，观察插头内部是否有明显水渍或湿润痕迹。
- 找到 NTC 传感器本体（通常位于集水槽附近），拔下传感器端插头，检查插头金属端子之间是否有水膜或氧化腐蚀引起的导电桥。
- 用万用表电阻档直接测量 NTC 热敏电阻本体两端阻值：室温下应在 10kΩ–50kΩ 范围内；如读数接近 0Ω，说明热敏电阻已短路损坏，需更换 NTC 传感器。
- 分别测量线束两端每根导线的通断：两根导线之间不应导通（无穷大）；如有导通说明线束内部短路，需更换线束。
- 用吹风机冷风档或压缩空气吹干传感器插头和线束插头内部，确认完全干燥后重新插紧，通电测试。
- 若 NTC 本体和线束均正常但故障依旧，说明主控板温度检测电路已短路损坏，需联系凯膳怡售后更换主控板。
English
Meaning
3-2 indicates that the main control board has detected a short circuit in the temperature sensor (NTC thermistor) circuit. Under normal operation, the NTC thermistor resistance fluctuates between several thousand and tens of thousands of ohms as water temperature changes. When the control board detects an abnormally low resistance (close to zero ohms), indicating a short in the thermistor loop, it displays code 3-2 and disables the heating function because the temperature reading is deemed unreliable for safe heating control.
Common Causes
- The NTC thermistor has experienced internal breakdown and shorting; the PN junction or resistive element is permanently shorted, resulting in near-zero resistance.
- The NTC sensor wiring harness insulation has been cut by the sharp metal edge of the tub, exposing two wire conductors that contact each other and create a short.
- Water or moisture has entered the NTC connector housing; moisture forms a low-impedance conductive path between the pins, equivalent to a short signal.
- The NTC thermistor probe seal has failed, allowing moisture to penetrate the sensor encapsulation and cause an internal short.
- The voltage divider resistor in the NTC detection circuit on the main control board is shorted, or the ADC input pin has suffered electrostatic damage and is shorted to ground, permanently outputting a short signal.
- The wiring harness was pinched by a screw or clip during a previous repair, pressing two wires together and creating a short.
Self-Check Steps
- Disconnect power, unplug the NTC sensor connector at the main control board end, and inspect the inside of the connector for visible water stains or dampness.
- Locate the NTC sensor body (typically near the sump area), unplug the sensor-end connector, and check the metal terminals for moisture film or oxidation-induced conductive bridging between the pins.
- Use a multimeter in resistance mode to directly measure the NTC thermistor body: at room temperature the reading should be in the 10kΩ–50kΩ range; a reading near 0Ω indicates the thermistor is shorted and the NTC sensor must be replaced.
- Continuity-test each wire at both ends of the harness: the two conductors should show no continuity between them (infinite); any continuity means an internal wire short and the harness must be replaced.
- Use a hair dryer on the cool setting or compressed air to thoroughly dry the interior of both the sensor connector and harness connector; reconnect firmly once completely dry, then power on and test.
- If the NTC body and harness are both normal but the fault persists, the temperature detection circuit on the main control board is short-damaged — contact KitchenAid after-sales service for control board replacement.