中文
含义
U4 为室内外机通讯故障。内外机之间的信号传输中断。
常见原因
- 连接线断裂或松动
- 通讯线极性接反
- 室外机断电
- 控制板通讯电路损坏
- 强电磁干扰
自助排查
- 检查内外机连接线
- 确认通讯线接线端子
- 断电重启
- 联系大金售后
English
Meaning
Communication fault between indoor and outdoor units.
Common Causes
- Connection wire broken or loose
- Polarity reversed
- Outdoor unit powered off
- Control board comm circuit damaged
- Strong EMI
Self-Check Steps
- Check indoor/outdoor wiring
- Verify comm terminal connections
- Power cycle
- Contact Daikin service