中文
含义
7-1 表示洗碗机的加热元件（加热管/加热器）出现故障。肯摩尔洗碗机通常在内胆底部安装有铠装加热管（Calrod 型加热元件），用于在洗涤和漂洗阶段将水温加热至设定温度，同时也辅助烘干阶段的热干过程。主控板通过监测加热回路中的电流值或温度传感器的升温速率来判断加热器是否正常工作。如果启动加热后一段时间内水温未出现预期上升，或者加热回路电流异常（过大或过小），控制板即显示 7-1 错误代码。在此故障状态下，洗碗机可能仍会尝试完成洗涤，但水温不足以有效清洗油污和杀菌。
常见原因
- 加热元件内部电热丝烧断，外观完整但已无法产生热量，是最常见的加热器故障。
- 加热元件的接线端子因长期大电流和高湿热环境而氧化腐蚀，接触电阻增大导致发热不足。
- 连接加热管的导线绝缘层在高温下老化变脆，端子附近导线断裂或即将断裂。
- 主控板上加热器控制继电器触点烧蚀或粘连，无法正常接通或断开加热回路。
- 加热管壳体因水垢过厚，导致热传导效率严重下降，温升检测未通过。
- 水垢或化学腐蚀导致加热管外壳出现微小裂纹，加热管对地漏电，触发了漏电保护。
- 水位传感器故障导致实际水位不足，加热管部分暴露在空气中，干烧保护动作切断了加热回路。
自助排查
- 断开洗碗机电源并关闭进水源，确保检修前设备完全断电断水。
- 拆下下层喷淋臂和滤网组件，直接观察内胆底部的加热管外观：正常应为金属色或灰色，如有明显的起泡、鼓包、变色或水垢堆积，提示加热管已有问题。
- 检查加热管两端穿入内胆处的情况，看密封垫是否完好无渗水迹象；如有漏水痕迹，密封件需要同时更换。
- 用万用表电阻挡测量加热管两个端子之间的电阻值：功率约 800-1200 W 的加热管在冷却状态下正常阻值约为 15-25 Ω。测得无穷大则电热丝已断路；测得零欧姆则为击穿短路。
- 用万用表兆欧挡或绝缘电阻挡测量任一加热管端子与机器金属外壳之间的绝缘电阻：正常应大于 2 MΩ。若阻值过低（如数十千欧以下），加热管已漏电，不可继续使用。
- 检查加热管端子上的接线是否牢固：拔下接线插片，观察端子是否发黑、氧化或有电弧烧蚀痕迹，必要时用砂纸打磨端子并重新紧固。
- 若加热管本身各项测试正常但洗碗机仍然不热，故障可能在主控板的加热驱动继电器或温度检测电路。此类故障需要拆机诊断，请联系肯摩尔授权维修人员处理。
English
Meaning
7-1 indicates a fault with the dishwasher’s heating element (heater tube / calrod heater). Kenmore dishwashers typically have a sheathed heating element (Calrod-type) installed at the bottom of the tub, used to heat water to the set temperature during wash and rinse phases, and also to assist the heated drying process. The main control board determines whether the heater is functioning properly by monitoring the current in the heating circuit or the rate of temperature rise from the temperature sensor. If the water temperature does not show the expected increase within a given time after heating starts, or if the heating circuit current is abnormal (too high or too low), the control board displays the 7-1 error code. In this fault state, the dishwasher may still attempt to complete the cycle, but the water will not be hot enough to effectively dissolve grease or sanitize dishes.
Common Causes
- The heating element’s internal resistance wire has burned out — the element appears physically intact but can no longer generate heat; this is the most common heater failure.
- The heating element’s connection terminals are oxidized or corroded due to prolonged exposure to high current and hot-humid conditions, increasing contact resistance and causing insufficient heating.
- The wire insulation leading to the heating tube has aged and become brittle under high temperature, and the conductor near the terminal has fractured or is about to fracture.
- The heater control relay contacts on the main control board are pitted, burned, or welded shut, failing to properly make or break the heating circuit.
- The heating tube casing has excessive scale buildup, severely reducing thermal conductivity and causing the temperature rise check to fail.
- Scale or chemical corrosion has caused micro-cracks in the heating tube sheath, creating a ground leakage path that triggers the earth leakage protection.
- A faulty water level sensor causes the actual water level to be too low, partially exposing the heating element to air, and the dry-heat protection activates to cut the heating circuit.
Self-Check Steps
- Disconnect the dishwasher from power and shut off the water supply. Ensure the appliance is completely de-energized and depressurized before inspection.
- Remove the lower spray arm and filter assembly to directly observe the heating element at the bottom of the tub. It should appear metallic or gray; obvious bubbling, swelling, discoloration, or heavy scale buildup suggests the heating element already has an issue.
- Examine the points where the heating tube passes through the tub wall — check that the sealing gaskets are intact with no sign of water seepage. If there are water marks, the seals need to be replaced along with the element.
- Use a multimeter in resistance mode to measure across the two heating element terminals: for an 800–1200 W heating element at room temperature, the normal resistance is approximately 15–25 Ω. An infinite reading means the resistance wire is open; a reading of zero means a dead short.
- Use the multimeter’s megohm range or insulation resistance range to measure between either heater terminal and the appliance’s metal chassis: the normal reading should be above 2 MΩ. If the resistance is too low (e.g., below tens of kΩ), the heating element has a ground leakage fault and must not be used.
- Check that the wiring connections at the heater terminals are secure: remove the quick-connect tabs and inspect whether the terminals are blackened, oxidized, or show arc erosion marks. If necessary, sand the terminals clean with sandpaper and refasten firmly.
- If the heating element passes all tests but the dishwasher still does not heat, the fault likely lies in the main control board’s heater drive relay or the temperature detection circuit. This requires disassembly-level diagnosis — contact a Kenmore authorized service technician.