中文
含义
Er rH 表示冷藏室（鲜食室）温度传感器（热敏电阻）故障。肯摩尔冰箱冷藏室内部安装有一颗 NTC 热敏电阻，通常位于冷藏室后壁中上部或顶部灯罩附近，用于实时测量冷藏室温度并反馈给主控板。主控板依据此信号控制风门开度和风扇转速，以精确调节进入冷藏室的冷气量。当热敏电阻开路、短路或阻值持续超出有效映射范围（约对应 -10°C 至 +55°C）时，主控板显示 Er rH 代码。故障期间冷藏室温控功能丧失，可能出现过冷（结冰冻坏蔬菜水果）或制冷不足（食物变质）两种极端情况。
常见原因
- 冷藏室热敏电阻的防水密封老化失效，冷藏室内高湿度空气（开门进入的湿气、存放蔬果散发的湿气）进入传感器封装壳内部，NTC 芯片引脚腐蚀断路。
- 用户在清洁冷藏室时，大量水或清洁液从传感器塑料帽的微小缝隙渗入，导致内部元件短路或长期残留液体腐蚀焊点。
- 热敏电阻在冷藏室内壁发泡层中的走线段，因泡层老化收缩产生剪切力，细如发丝的传感器导线在泡层与内胆交界处被拉断。
- 冷藏室后壁蒸发器盖板（风道盖板）安装不当，挤压到传感器线束，导致绝缘层破损后导线与蒸发器铝翅片接触短路。
- 主控板上的传感器信号分压电阻（通常为精密贴片电阻，如 10 kΩ ±1%）因长期工作或潮湿环境导致阻值漂移，ADC 采样值对应温度计算偏差超过保护阈值。
- 冰箱经历过电源浪涌或雷击，瞬间高压通过电源线窜入主控板，烧毁传感器信号通道的 ESD 保护二极管或 ADC 输入端口。
- 传感器在冷藏室内的塑料固定座因反复冷热交替而变脆断裂，传感器脱落后悬垂在出风口附近直接接触冷气，测得的温度异常低，主控板误报故障。
自助排查
- 观察冷藏室实际降温情况。将一杯水放在冷藏室中层搁架中心，6 小时后用温度计测量水温，正常应在 2-5°C。若水温接近 0°C 结冰或高于 8°C，说明温控异常。
- 检查冷藏室后壁或顶部灯罩附近的传感器位置（通常为一个带通风槽的白色塑料小盖帽或平贴在壁面上的圆形凸起），确认传感器盖帽是否完好、是否有松动或脱落。
- 如果传感器表面有凝结水珠或覆盖冰霜，用干布轻轻擦干，检查周围是否有出风口直吹传感器导致局部过冷的现象。
- 断电后拆下传感器盖帽（通常用一字螺丝刀轻轻撬下），检查传感器内部是否有积水、铜绿或霉斑。如有，用吹风机冷风档远距离吹干（切勿用热风以免损坏热敏电阻），清理后装回。
- 找到主控板（冰箱顶部铰链盖内或背部压缩机仓上方），拔下传感器线束插头，用万用表测量热敏电阻阻值。常温（25°C）下正常约 5-10 kΩ，手握加热到约 35°C 时阻值应降至约 3-6 kΩ。阻值不变化或短路/开路则传感器损坏。
- 检查主控板传感器插座焊点，必要时重新补焊虚焊的插座针脚。
- 若传感器阻值变化正常但代码仍存在，主控板采样通道可能已损坏。请联系肯摩尔售后更换冷藏室热敏电阻或主控板组件。
English
Meaning
Er rH indicates a fresh food (refrigerator) compartment temperature sensor (thermistor) fault. Kenmore refrigerators have an NTC thermistor installed inside the fresh food compartment, typically located on the upper-middle portion of the rear wall or near the top light housing. It measures the fresh food compartment temperature in real time and feeds the data back to the main control board. The control board uses this signal to modulate the air damper opening and fan speed to precisely regulate the amount of cold air entering the fresh food section. When the thermistor is open-circuit, short-circuit, or its resistance remains outside the valid mapping range (approximately corresponding to -10 °C to +55 °C), the control board displays the Er rH code. During the fault, the fresh food compartment loses temperature control and may exhibit either of two extremes: overcooling (freezing and damaging vegetables and fruits) or insufficient cooling (food spoilage).
Common Causes
- The moisture-proof seal of the fresh food thermistor has aged and failed. High humidity in the fresh food compartment (from door openings and moisture released by stored produce) has entered the sensor encapsulation, causing NTC chip pin corrosion and open circuit.
- During cleaning of the fresh food compartment, a significant amount of water or cleaning solution has seeped in through tiny gaps around the sensor’s plastic cap, causing internal component short circuits or leaving residual liquid that progressively corrodes solder joints.
- The section of thermistor wiring routed through the foam insulation layer in the fresh food inner liner has been subjected to shear stress from aging and shrinking foam. The hair-thin sensor wire has fractured at the boundary between the foam layer and the inner liner.
- The fresh food compartment rear evaporator cover (air duct cover) has been improperly installed, pinching the sensor wire harness and damaging the insulation, creating a short circuit between the exposed conductor and the aluminum evaporator fins.
- The sensor signal voltage-divider resistor on the main control board (typically a precision SMD resistor, e.g., 10 kΩ ±1%) has drifted due to prolonged operation or humid conditions, causing the ADC-sampled value to correspond to a temperature deviation exceeding the protection threshold.
- The refrigerator has experienced a power surge or lightning strike; the momentary high voltage traveled through the power cord into the main control board, destroying the ESD protection diode or ADC input port on the sensor signal channel.
- The plastic mounting bracket for the sensor inside the fresh food compartment has become brittle and fractured from repeated thermal cycling. The detached sensor hangs near the air outlet in direct contact with cold air, reading an abnormally low temperature and causing the control board to falsely report a fault.
Self-Check Steps
- Observe actual cooling performance in the fresh food compartment. Place a cup of water on the center of the middle shelf. After 6 hours, measure the water temperature with a thermometer — normal range is 2-5 °C. If the water is near freezing (0 °C) or above 8 °C, temperature control is abnormal.
- Locate the sensor position on the fresh food compartment rear wall or near the top light housing (typically a white plastic cap with ventilation slots or a round flush-mounted protrusion on the wall). Check that the sensor cap is intact, secure, and not loose or detached.
- If there are condensation droplets or frost on the sensor surface, gently wipe it dry with a cloth. Check whether an air outlet is blowing directly onto the sensor, causing localized overcooling.
- After disconnecting power, remove the sensor cap (usually pried off gently with a flathead screwdriver) and inspect the inside for water accumulation, green copper rust, or mold spots. If present, dry it by blowing cool air from a hair dryer at a distance (never use hot air, which would damage the thermistor), clean it, and reinstall.
- Locate the main control board (behind the top hinge cover or at the back above the compressor compartment), disconnect the sensor harness connector, and measure the thermistor resistance with a multimeter. At room temperature (25 °C) the normal value is approximately 5-10 kΩ; when warmed by hand to approximately 35 °C, it should drop to about 3-6 kΩ. No change in resistance, or a short/open circuit, indicates a defective sensor.
- Inspect the solder joints at the sensor socket on the control board; re-solder cold joints if necessary.
- If the sensor resistance changes normally but the code persists, the control board sampling channel may be damaged. Contact Kenmore after-sales service to replace the fresh food thermistor or the main control board assembly.