中文
含义
电流切断保护。系统检测到运行电流异常超过预设的保护曲线，IPM（智能功率模块）或电流检测电路触发切断。区别于H16的过流保护，H31更侧重于瞬态电流冲击。
常见原因
- 压缩机启动瞬间浪涌电流过大，超过IPM模块的耐受能力
- IPM模块内部IGBT短路或驱动电平异常
- 电源电压瞬间大幅波动（如电网闪变）
- 压缩机转子位置检测异常，启动时序错误导致堵转
- 室外机主板上电流检测电路滤波电容老化
自助排查
- 关闭空调后等待5分钟再重启，确认是否为瞬时波动引起的保护
- 使用万用表记录供电电压，观察是否在正常范围内稳定
- 检查压缩机启动电容是否正常
- 若频繁出现，可能为IPM模块或压缩机故障，需专业人员检测
English
Meaning
Current cut protection. The system detects that the operating current has exceeded the preset protection curve. The IPM (Intelligent Power Module) or current detection circuit triggers a shutdown. Unlike H16 (sustained overcurrent), H31 focuses on transient current spikes.
Common Causes
- Excessive compressor startup surge current exceeding IPM module tolerance
- Internal IGBT short circuit or abnormal gate drive level in the IPM module
- Rapid large fluctuation in supply voltage (e.g. grid flicker)
- Abnormal compressor rotor position detection, starting with incorrect commutation timing
- Aged filter capacitor in the outdoor main board current detection circuit
Self-Check Steps
- Turn the AC off, wait 5 minutes, then restart — rules out transient fluctuation
- Record the supply voltage with a multimeter — check for stable operation within the rated range
- Check the compressor start/run capacitor for normal capacitance
- If the fault recurs frequently, the IPM module or compressor may be faulty — professional diagnosis is needed