中文
含义
F4 为缺相保护（三相供电机型）。三相电源中缺失一相或一相电压异常时触发保护。
常见原因
- 电源缺相（某一相保险熔断或断路器跳闸）
- 电源线接触不良
- 三相电压不平衡
- 供电变压器故障
自助排查
- 用万用表分别测量三相电压是否正常
- 检查配电箱对应断路器是否跳闸
- 检查电源线是否完好
- 确认三相电压平衡度在允许范围内
- 联系电工或电力公司检查供电
English
Meaning
Phase loss protection (for three-phase models). One phase of the three-phase supply is missing or abnormal.
Common Causes
- One phase fuse blown or breaker tripped
- Power cable loose contact
- Three-phase voltage imbalance
- Supply transformer fault
Self-Check Steps
- Measure all three phase voltages
- Check if circuit breaker has tripped
- Inspect power cable integrity
- Verify voltage balance within spec
- Contact electrician or utility company