中文
含义
化霜故障。冰箱蒸发器化霜不彻底或无法进入化霜循环，导致蒸发器结冰严重，风道堵塞，冷量无法循环，最终冷藏室温度升高、压缩机长时间不停机。
常见原因
- 化霜加热器开路或损坏，无法加热除冰
- 化霜温度保险丝熔断（通常断开温度约70-85℃）
- 化霜温度传感器损坏，主控无法检测蒸发器温度
- 化霜继电器触点粘连或烧毁
- 化霜定时器（机械式/电子式）故障，跳过化霜周期
自助排查
- 断电后打开冷冻室背板，观察蒸发器是否被厚冰覆盖
- 用万用表测量化霜加热器两端阻值，正常几十到几百欧姆
- 检查化霜保险丝是否导通
- 如手动强制化霜后恢复制冷但反复结冰，需维修化霜电路
English
Meaning
Defrost system failure. The evaporator defrost cycle fails or does not initiate, causing heavy ice buildup on the evaporator, blocked airflow, rising fridge temperature, and continuous compressor operation.
Common Causes
- Open or failed defrost heater element unable to melt ice
- Blown defrost thermal fuse (typically rated ~70-85°C)
- Failed defrost temperature sensor preventing the main board from detecting evaporator temperature
- Welded or burned defrost relay contacts
- Faulty defrost timer (mechanical or electronic) skipping the defrost cycle
Self-Check Steps
- Power off, remove the freezer back panel, and check the evaporator for heavy ice accumulation
- Measure the defrost heater resistance with a multimeter — typical range is tens to hundreds of ohms
- Check the defrost thermal fuse for continuity
- If manual defrost restores cooling but ice builds up again quickly, the defrost circuit needs professional service