中文
含义
净化器内部的备用纽扣电池（用于维持WiFi连接和时钟设置）电量过低或已耗尽。主净化功能不受影响，但网络连接和定时功能可能断电后丢失。
常见原因
- 内置备用纽扣电池自然放电耗尽（正常使用寿命约2-3年）
- 净化器长期断电不使用，备用电池深度放电无法恢复
- 备用电池电路充电管理芯片故障
- 备用电池接触弹片氧化导致充电回路开路
- 机器长期处于低电量状态且WiFi频繁唤醒加速电池消耗
自助排查
- 保持净化器通电运行24小时以上，让备用电池有机会充电
- 检查WiFi模块是否正常——如果每次断电后需要重新设置WiFi，说明备用电池失效
- 重置WiFi连接后观察ERR B是否消失
- 长时间通电后ERR B仍存在，说明备用电池已无法充电保持
- 备用电池通常为主板上焊接的CR2032或类似规格纽扣电池，需专业更换
English
Meaning
The internal backup coin cell battery (maintaining WiFi connection and clock settings) is low or depleted. Main purification function is unaffected, but network and timer settings may be lost after power loss.
Common Causes
- Natural self-discharge of the backup coin cell battery (typical service life 2-3 years)
- Purifier left unplugged for an extended period, causing deep discharge of the backup battery
- Faulty charging management IC for the backup battery circuit
- Oxidized backup battery contact springs breaking the charging circuit
- Frequent WiFi wake-ups while the unit is in low-power standby accelerating battery drain
Self-Check Steps
- Keep the purifier powered on for 24+ hours to allow the backup battery to charge
- Check WiFi module behavior — if WiFi settings reset after every power loss, the backup battery has failed
- Reset the WiFi connection and observe whether ERR B clears
- If ERR B persists after extended charging, the backup battery can no longer hold a charge
- The backup battery is typically a soldered CR2032 or similar coin cell on the mainboard — professional replacement required