中文
含义
室内机与室外机通讯故障——内外机之间信号传输中断或数据错误。
常见原因
- 室内外机连接线松动、接错或断裂
- 通讯线路受强电磁干扰
- 室外机电源板或主控板损坏
- 室内机主控板通讯接口电路故障
- 连接线过长或线径过小导致信号衰减
- 雷击或浪涌损坏通讯芯片
自助排查
- 检查室内外机连接线是否牢固，接线端子有无氧化
- 确认连接线极性是否正确（S 信号线不能与 L/N 混淆）
- 用万用表测量通讯线直流电压，正常应有跳变的脉冲信号
- 排除附近是否有大功率设备造成干扰
- 若线路正常，可能为主控板故障，需联系售后维修
English
Meaning
Communication failure between indoor and outdoor units — signal transmission interrupted or data corrupted.
Common Causes
- Loose, miswired, or broken indoor-outdoor connection cable
- Strong electromagnetic interference on the communication line
- Damaged outdoor unit power supply or main control board
- Faulty communication interface circuit on the indoor mainboard
- Excessive cable length or undersized wire gauge causing signal attenuation
- Lightning or power surge damage to the communication IC
Self-Check Steps
- Verify the indoor-outdoor connection cable is secure and terminals are not corroded
- Ensure correct wiring polarity (S signal wire must not be confused with L/N)
- Measure the DC voltage on the communication line; a pulsing signal should be present
- Check for nearby high-power equipment that may cause interference
- If wiring is intact, a mainboard fault is likely — contact service for repair